As healer I often do a quick check to see if parties have been abandoned in a dungeon. I wish there was an option to check only groups already in progress.

Sometimes you can tell why a group got ditched if they're not very good, but a lot of times they had bad luck or just had someone who ditched. I've gone through plenty of lower dungeons in parties who had only had DD left.
(Also had a funny time where an LS mate asked for help and I got placed in a different party that had lost their healer, finished with them, then popped in again and did it with my LS mate).

I hate withdrawing from a brand new party, but I don't have to do it often since if you click 5 dungeons there's usually one in progress that needs a healer.