No downtime (regen) means you are essentially chained to your keyboard the entire time you are playing. No downtime means groups become more intensive, and less friendly. Its no social all kill. Talk after the dungeon. Some like that. Some dont.
On a side note:
Things I liked about EQ.
Staff of Temperate Flux
Jboots
Fishbone Earring
Playing with a really good Enchanter/Bard
Getting random SoWs
Running through Sirens Grotto
Racing to a Spawn
Breaking into Fear
Ogres
Large Raids (raiding with 50+ people feels like your are in a small army, WoW sucked when raids got smaller, and more needlessly complex. It felt like being a dancer in a bad JLo Video.)
GM Events
Cazic Thule
Running from Karana to Qeynos as a level 4 to change bind spot and being scared shitless of every single thing I saw.
GFluxing.
Now, there was plenty that sucked too. Dont get me wrong. But at the core there were assloads of really great moments in EQ. In WoW, it was fancy and flashy and slick and well done, but nothing was really memorable. I guess EQ was kinda like getting laid in high school in the backseat of your moms car. It was exciting, and sloppy, and poorly done, and you wouldnt necessarily do it again... but it was fun. WoW was like fucking a stripper. Its was fun for a bit, she was hot and sexy.. but in the end it got too needlessly complicated, and you have glitter everywhere.
Hopefully what we get with EQ Next is that girl from high school grew up and is now a sexy classy woman with no drama issues who is fun to hang out with.