I've been diving a drysuit since 1993. No P valve, but I did have a P-zip fitted to one which rarely got used so not bothered on the last 2 suits.
Last Saturday I did 2 x 50 minute dives with an hour surface interval, with coffee, then drove 30 miles before needing the restroom.
I'm envious for sure. I think for me just getting in the water and the webbing being tight I think about peeing...and then at some point I kind of have to pee...but even if I don't I'm still thinking about it. I'm just a mess in that department. BUT, being able to NOT think about it, or just let go when needed is amazing, at least to me.
For me I do not want my diving to revolve around my bladder, so a p valve makes sense. I realize everyone's different though. I'm not trying to convince anyone to do anything different, just relaying what works for me. Again, I'm pretty envious of the guys that just don't have to go...