It's 50/50 between staying home and going to a party when the Steelers are not in the SB, but when the Steelers are playing I either stay home with family only, or go to the game itself
I was 12 years old in 1979 so I obviously watched the first 4 Steeler Super Bowls at home.
In 1995 against Dallas I was a nervous wreck the entire game but felt the Steelers were going to pull it out when they got the ball back with ~5 minutes left down by only 3. I had Emmit Smith that year in FF and watch a lot of Cowboys games and each game the Cowboy's lost during the regular season they got this WTF look/posture/whatever like "We are the Cowboys, how is this happening to us?" and I swore I saw it on the Cowboys duringthe 4th quarter of that SB. Bam Morris couldn't be stopped, onside kick, Steelers had all the momentum. O'Donnell threw the first pass too high on first down but A. Hastings got two hands on it and still couldn't hall in that pass. After the game we learned he was playing with a partially separated shoulder. The next O'Donnell pass was to Larry Brown and the game was basically over at that point. I was devastated by that loss because I wanted to experience a SB win as an adult.
In 2005 the Steelers beat the 4 of the top 5/6 offenses in the league that year in CIN, IND, DEN, and SEA. The run this D went on would be remembered more if there wasn't controversy around the SB. Speaking of their run in the playoffs, I remember a bunch o things vividly from the IND game. The Steelers came out throwing the ball early to get a 14-0 lead on their first two possessions and then started leaning on their running game. I also think Cowher had his single best coaching moment of his career in this game. When T. Polamalu made that diving interception, rolled over, fumbled and then recovered it himself everyone thought it would be Steelers ball. And when the call was overturned he was as calm as I have ever seen him. I think his calmness kept the team from freaking out and helped them continue to play well. When J.Betttis fumbled at the one yard line I jumped off my couch and screamed "HE FUMBLED THE BALL!?!?!?!?!?!" I went from thinking the game was sealed to thinking they would lose. Would have been a crushing way to lose given how good they played in that game, along with it being Bettis' last year.
In 2008 my brother and I went to the game in Tampa. Simply the best day of my life (not related to my family, marriage, kids born, etc). I might feel different is the Steelers lost, but they didn't

It was a great game, pretty much back and forth the whole time, with huge plays by both teams. When Fitz caught his long TD he looked at the jumpo tron behind us and I could have sworn he was looking right at me. After that I said to my brother, "Ben is going to pull this out" S. Holmes' catch was awesome and Woodley sealed the game with a sack, Harrison's INT return was toward our endzone too. We hung around the stadium as long as possible near the Steelers locker room entrance to watch the players and coaches run into the locker room. Security had to kick us out before we would leave, we wanted to savor every second we could. It was just a great day.
In 2009 I watched at home with family and the Steelers started out really bad. At one point they were down 21-3 in the first half and I was worried I was going to see a GB route. But I told my wife the Steelers get the ball to start the 2nd half, so if the score before halftime and score again on their opening drive of the 2nd half it would be a ball game again... and sure enough that's exactly what happened. I was stoked and thought if the Steelers could take the lead after being down by so much, the Packers might wilt a little under the SB pressure. But alas, Big Ben missed a wide open Wallace for a TD and then later (in the same drive?) Mendy fumbled, the Packers scored on that possession which again put the Steelers too far behind allowing GB to play more comfortably with the lead. The Steelers still fought and came back to make it respectable, but they just couldn't overcome a turnover margin of -3 especially since the Pack scored 21 points off those turnovers. I'm not saying the Steelers would have won if Big Ben hits Wallace, or if Mendy doesn't cough up the ball, but when I think of this game I will always recall the Steelers missed opportunities to take the lead. Had they done that it would have been really interesting to see what happened. But I'm not complaining, the Packers deserved to win, A. Rodgers was on fire that day (and all through their playoff run).
Can't wait till they get back