I did this on my WHM but only because being a healer there's like no queue. Leveling SMN now and I'm level 43, never got into a dungeon yet. Waits up to half an hour when I could just go level. I agree though, it is a lot better to do dungeons, but I can see why people would be put off since the wait times are ridiculous.

I've just decided that when I hit 50, I'll just go run dungeons before I start farming stuff for end game. Sadly, a lot of people will just go straight onto end game stuff...