Opinions
I quit DND 3.5 after many years of love/hate with DND. I have always hated the spells per day limiting MY stories. To me, an encounter, heal up, hole up in a room until we can med, oh well, bad rolls on the heals, rest up again. YUCK! And prep time had increasingly been an issue with life and the intrusion of MMORPGs.
I have never found the roleplay quality in a MMORPG that I had hoped to. On the flip side, my table top experiences over the last three years have not been that great either. Other games systems had their own problems of people not wanting to learn the basic mechanics, lack of familiarity with the settings, no idea what to do in them.... MMORPGs became an increasing lure from the sheer fact of ... I don't have to prep to play.
Now, 4E does take some things from MMORPGs, but I think these are improvements. As a DM, I could play smart monsters going after the clerics and casters, but what tools aside from damage did the other players have to save them? AOO? Trip attack? Snare spell? Some taunt mechanics and whatever else 4E is going to add should allow me to play smart monsters and put some fear into the mages without it coming across as a personal grudge against the poor guy with d4 for hit points.
Recycling resources per encounter means the adventure progresses at a more 'natural' pace story wise. Sure, you are not up to full potential, but you can still handle that 'random' wandering encounter set to mess with your rest cycles.
Reduced prep time, fun character options at each level, faster leveling, all this equates to more fun for me as a DM. So, while I started reading up on 4E, expecting it to be the final nail in the coffin, I am very enthusiastic about the game. Rather than bashing it for picking up elements from WOW, you should applaud it for taking the right elements from WOW to make it an exciting enough choice for me to want to play it more than I want to play WOW.