Coming from WoW...

Hello,
I have a 60 druid in World of Warcraft but i am looking into another game. ive had people talk about GW and it looks very good, but im wondering if anyone else has made a switch from WoW to GW and i would just like to know how smoothly it went. also i would like to know how the UI compares to that of WoW and if there are billions of mods i can DL and use to make playing easier and more enjoyable.
Thanks in Advance,
FP

I've not come from WoW, but I can tell you there are no mods to the game. There is a damage program somewhere (so you can work out the damage you'd do with x weapon, x skill against x monster i think) and there is the interactive map located on this site, but I believe that's it.