Leveling in WoW is easy.
Its only slower on your first char cuz you don't know where to go, what quests to pick up, where to go to complete those quests, and you have to look everything up.
Second char levels 2x as fast.
Both level faster than SRO.
You do NOT level by grinding in WoW.
You get a billion quests. Go kill 4 of these mob, 3 of these, and 6 of these.
Kill 13 mobs, turn it in for a quest reward (that at lower levels) gives you like 20% of your level.
I prefere to fill my log, get 10-15 quests or as much as I can in an area, knock out the whole list, and turn them in all at once.
Many quests give you items, money, and XP. Its fun. Some chain quests give you really nice items (for your level, anyway) which give you more drive to do it.
Even if your lower level, getting blues and pimping out your char is fun =) and enjoyable.
Pairing with Cyclone (healer) and I (warrior) from levels 1-60, we could kick out entire areas in one evening, every evening, then go do an instance to get gear / have fun.
We both had a week off at the same time around xmas, so we did 50-60 in less than a week.
They still call it 'grinding quests', but if your an SRO veteran, that word 'grind' is a JOKE.
It was cake.
Even easier if I made a second char, don't have to look up shit or figgure anything out this time.
60-70 when the cap went up wasnt bad. Did most of it in instances.
It took my twice as long to do 60-70 than the couple players in my guild who don't have a RL job or school, but whatever. They're 1337, and I have a life.

Wow, imo was a lot more fun as a lowbie leveling up. Even tho the desire is to hit cap, you dont see that until you do. It was soooo much fun learning, leveling, getting items and meeting people.
At end game, that changes, into whos most 1337, which guilds own, whos in kara first, who has downed the most bosses
And really... I dont enjoy it much. Its all 'ownage' and 'e-peen'. The players / people you meet are much nicer along the road to cap.
Once your capped, its 100% e-peen.
If you browse the big guilds websites, they have rules like
-You must attend raid 5 nights a week
-You must donate your matts to the guild bank
-You must be this spec, for this class.
Most of them, being 5 people who started the guild, who get everything, and are loaded - the rest are pawns. Many big guilds 'booted' half they're loyal MC BWL NAXX members because the expansion is 25 man raids, and they didnt want to gear the others anymore.
Visit their forums. Forums tell you .....everything.
The people that were mass booted, of course angry especially after months of service, just get flamed up and down and called cowards.
Sadly, THIS IS the most efficent way to achieve content, get gear, and own.
But takes a lot of enjoyment away from 'playing video game.'