I've been to a lot of Widespread Panic shows, and I regret not seeing them more before Mikey died. Though, I was pulling some quality tail at that time, so I kind of give myself a pass.
I've been to probably 100 Panic shows, maybe 30 of those were with Houser. I'm thankful I was able to see him that much. I'd trade in my 25-30 or so George McConnell shows for 1 pre-hiatus Phish Show.
My regret is that Phish took a 4 year hiatus right when I was 18-22 years old. I was able to see Phish 2.0 four times, the "final" Coventry shows being 2 of those. It was average at best.
Was able to see them this past summer and they were smoking.