I'm back over in Belfast next weekend for work (I now live in London but run a team that are mostly based out of Belfast). I lived there for 6 years 2000 - 2006 (grew up in North Down and then went to Queens). The improvement now from then always shocks me. The vegan options thing is very real (not that I am vegan, but I noticed it). There's a place I went to last time I was there, it's down near the Kremlin. A bar in a big old warehouse with a load of pop-up style food places along one side. By all accounts, a condition of getting a food place in there is that you had to have vegan options. It was great, you could sit and have your pints, then dander over and get whatever food you wanted, good variety too, cracking poutine. Maggie Mays up by queens also has a full, separate vegan menu.
I do miss the old Limelight and Auntie Annie's though.