In Northrend, I absolutely detest a few of the vehicle quests. There's some where you can get into a vehicle/mount a dragon, and although target - follow does not work, focus follow does. There are others, where I cannot get any form of follow to work. Best case scenario then is fly them a bit at a time, towards the location and then do the quest on one with the others nearby.

For the most part, the Northrend collections are at least an extra reward for a grind session. Generally grind sessions are the least painful with a distraction like a dvd going, with half your attention on each. I battleground like that too, enough attention to notice anyone coming into my tower, but a distraction so sitting in a tower until it burns is not too boring - especially when you end up guarding the same 1-3 towers a BG for a score or three of BG's.

In Outland, I used the Brian Kopp leveling guide. It's a quest stacker, and very easy to follow. He actually sold it, pre BC and as promised all future content for warcraft was free. Unfortunately, with Wrath, he said Warcraft + Warcraft Burning Crusade is one game, but Warcraft Wrath is another. Shame that his word is basically meaningless. If you want to go with a guide, the James (or is it Jamie's) guide is free and almost as good.

I'm using the Extreme Leveling guide in Northrend, and pace wise its a faster stacking method then the Kopp guide, but the instructions aren't nearly as good; without quest helper/wowhead I'd be lost a few times going strictly by this guide. For me, Outland was 100x better then Wrath, I actually quit wow, or took a break if you prefer, twice for six and two weeks, because the Northrend quests can be such shit for boxing.

Definitely consider instances as an option anytime questing gets boring or feels slow. I found Outland to have plenty of quests to get you to 70th (Northrend at 68 is faster), even skipping an entire zone and avoiding the slower collection quests. Unfortunately, without extensive instancing, you need to do a ton of Northrend collections. Even if you do instances, the collections open kills which lead to collections which lead to kills, eventually opening up extremely lucrative dailies for boxing. Basically, you'll want to do them, to get to the dailies.