another vote for golf
I'm like a 20 handicap and would love to be a 5
My index just hit 5 for the first time so I'll try to explain what you're missing.
Pros:
1. No truly bad rounds. I know in my last 60-70 rounds I've never shot 90 or worse and I'm honestly not remembering a score worse than 86 or 87. So, it's very comforting stepping on the first box and knowing that no matter how "badly" I may play, it may be frustrating but never embarrassing.
2. I can play with anybody except for maybe the pros at a very challenging course with Major conditions. This kind of ties in with point 1, but I now commonly often play with scratches/plus handicaps and what separates us over 18 holes is general the aggregation of their seemingly
de minimis better proximity to the hole and total putts. In other words, their 72 is obviously better than my 78 or whatever at the end of the round, but it doesn't look at that different during the round. So, barring those incredibly challenging conditions where my flaws would be exacerbated, I can probably tee it up with like a John Rahm and not at least look or, more importantly, feel silly if I got paired with him. Don't get me wrong, he'd crush me and I think would be giving me almost a stroke per hole which is nuts, but my point is that I wouldn't significantly slow him down, annoy him, and we'd least appear to the novice neutral observer that it makes sense we're playing together. In short, to quote my plus-handicap playing partners, as a 5 I generally hit the ball where I want to.
Cons:
1. It's really, really hard to get better. Unless I quit my day job and focus on golf, I doubt I'll ever get a ton better because I just don't have the time to and, right now, my margin for error in getting better is really, really tight and probably requires significantly more practice (e.g. improving proximity to hole, three-putt avoidance, course and tee box management). Additionally, with turning 40 and my length inevitably plummeting here in the next few years/decade, I will need to work hard to improve make short game to make up for my lost length so I probably never improve just based on my regular play.
2. It's really, really hard to win tournaments now. I say this because where I had this wonderfully dangerous variance and volatility as a double-digit handicap and I could legitimately beat my handicap by several strokes on a good day, I now basically live in this 6ish or stroke window (76-82) that makes it really challenging for me to win a 100% handicapped net game. For example this past weekend I shot a 76 on the last day of a three-day tournament - which is me playing really well with very few mistakes and no disastrous errors - but still barely moving the overall needle in the net game as higher handicaps had a few putts go in that maybe normally wouldn't and shot multiple strokes better than their handicap whereas my very solid to really good day only beat my handicap by 1 stroke.
Tl;dr: Being a 5 handicap is fun because you can hold your own with anybody, but it's really, really hard to win tournaments and can feel monotonous over the course of time.