I played WoW from Vanilla to Cata. I've played most characters from hunter to mage and all up to lvl85. Only one I didn't play was rogue. I dual-boxed it, multi-boxed it, arena'd it but was never an end game raider. I now play Rift. I play on the defiant side with a cleric, warr and a rogue and have to say I'm really enjoying every aspect of it. Including questing.
Vanilla WoW was brilliant, BC had some great aspects to it, WotlK was when the decline in game play and player spirit started and Cata is basically rubbish. I cannot possibly imagine starting a new character in WoW. Going from 1 - 85 across all those zones, even with the buffed xp (which means you don't have to do all that BC has to offer) is a no way, never going to happen proposition. Questing in WoW today is varied - from collect 10, kill 10, blow up 10 and pick up the bits 10 - but boring. There's a couple of quest lines which are really epic and fun but those are few and far between. And when you get to 85 and you think you're there then think again. You're going to have to do all the dungeons X times to get gear got enough to do heroics. Then you'll have to do em all again at heroic level to get gear for raiding. Then you need to find a stable, reliable raiding guild and at that stage basically give up any life you thought you had to raid. Either you commit to end game raiding or WoW stops dead in it's tracks as a game.
At 85, if you want to get into even an heroic dungeon then it'll be the ilvl discussion. If you don't have ilvl345 or above then you won't get in. And if you do get in, the impatience and rudeness of the community is just truly amazing. The simplest error and bam, people start leaving the group. PvP is arena - most BG's are boring. AB, AV, EoS etc - done em, been there, which ever side has the best gear wins. Tactics are rush, rinse and repeat. Typical in game insults are 'noob', 'retard' and that's about as good as it gets. Rift however is surprisingly refreshing.
As there's lots of ex-WoW players the skill level is very high and there's a spirit and community which is tolerating. There's some good questing ideas - and fun ones too. For example, at ca. lvl15 there's a quest line which tests your gear and endurance - you have to eat cheese and I had to laugh. There's some very tight areas pakced with mobs with short spawn rates which means you have to pull mobs with care, kill quick, do what you need to and then get out. Really fun because you can really get yourself into a tight spot where only skill will keep you alive. Then there's rifts which have the effect of breaking up the questing process while granting you xp and if players are in the area you get to opt in to a public group. This can be really fun. And then there's world raids. This is when Rift gets to be epic. Imagine a raid level boss, geared for the zone and the number of players and everybody gets to join in.
The soul system in Rift means there are no cooky cutter specs and with 8 souls available you can really have fun with your play style. The Black Garden is novel, hasn't got boring yet and because you can respecc easily, I can play healer today, attack and offensive tomorrow - which again keeps the game fresh.
Rift is epic. You'll have more fun with Rift than you will with WoW.