Yeah, what used to be considered "speed running" is just the norm now. It's not exclusive to expert dungeons either. You could even run Sastasha (normal) with mass pulls with the right players and party composition. In fact, I can't think of a single dungeon in the game that I haven't seen done this way successfully at some point.

For me it's not simply about saving 5-15 minutes, but also about being able to use my abilities to the fullest. I can't stand fighting only 3 mobs with such powerful AOEs and cooldowns to boost them even further...it's just not fun for me, and I don't feel strong this way. For those who don't appreciate faster runs, I'm not going to talk shit, but I think a lot of people out there just don't know, or care (probably the latter) that they could be performing better. I play for fun like anyone else, and efficiency is a hell of a lot of fun for me. I find it strange that people vilify this line of thinking, since not everyone who enjoys this style of play is antagonistic about it.

As far as the OP is concerned, if you let people know at the start of the dungeon that you're new, or have ADHD and are uncomfortable with large pulls, then I think you'll find some people will be understanding towards your case. I can be patient with such groups since I know that 90% of my time in DF will be spent doing the normal-paced runs anyway.