If you don't enjoy being 60 you probably won't enjoy being 80. However, that being said, there are a bunch of really fun talents etc that you start getting at 60 and above. Getting Titan's Grip for example although not as cool as it once was, is still a big moment of "omg awesome" , and getting Divine Storm on a ret paly is a pretty exciting day.
Plus once you hit Outlands your (presumably) bad gear will be almost completely replaced in the first 20 quests, and quests get easier and can be done faster. The days of "Gather me these four things; here is a seperate fucking sheet you get to hold in your inventory to read what I need, ps 2 items are in instances and the other two on seperate continents all for 5k fucking EXP" are over which is nice.
Once you hit WOTLK you'll have so many item choices while questing that it's literally laughable. Nearly every quest rewards some type of armor or weapon, (which actually makes you learn more about the game as you figure out which stats you want versus say the 2-3 that were only available to you before) and (at least on my servers) ganking is a pretty rare occurance. There will invariably be some dickhead DK killing everything at Thrallmar/Honor Hold, but otherwise it should be fine.
Again though, if it feels like a drag now, 70-80 will feel like ridiculous torture. Just remember you only need 68 to get quests in Northrend.