Raiders! Krasus’ Landing sucks. If you aren't a mage, you have your hearth in Dalaran. Going from one of the few inns out to Krasus’ Landing and then flying to ICC requires you do dodge all of Dalaran's no fly zone. You can skirt to the north and/or below Dalaran. But it is just irksome.
I loved it when ToC was the thing to do. Not because it was a good instance -- it wasn't near the top of the list. But I liked it because of the portal tabard. The Black Temple was a good instance, if but a little too hard. And it had a very nice neck piece for frequent visitors.
Now, if you have an engineer, you can use your personal wormhole to flip around Northrend once every four hours. That only helps you with The Eye and Ulduar, which don't see much activity these days.
Express Raider Travel Options
Since they're not going to rotate Dalaran 180 degrees any time soon and point Krasus' Landing in the right direction, I'll give you two very nice alternatives. Pleasant even!
Hearth and Travel Option #1: If you really like to camp at one of the two public respectable inns in Dalaran instead of riding to Krasus' Landing and then flying around Dalaran, ride to the Violet Citadel. Take the portal up near the rep vendor, opposite the portal to Tanaris. Once in the Purple Parlor walk outside. Mount up and fly directly to ICC.
Hearth and Travel Option #2: If you don't mind the smell of garbage and blood, set your inn to the one down below in the sewers. When you hearth, you will be a quite literally just a step away from a vendor, your bank, the guild vault, and a mailbox. When you want out, just mount up, and ride down the tunnel. Switch to your flying mount at the end and fly directly to ICC.
I'm still using Option #1. I like to see people and don't mind capturing gearscores as I do. But option #2 really is just missing an AH and toilet. Then you'd never have to leave.
Logging In The Field
When I raid, I usually login with only a few minutes before the start of a raid. So I will usually fly Kheldul to the instance and logout right there -- either a day or two in advance. I'll resupply with mail from my alt courtesy of my squire. I'll mount up and repair and sell any junk I don't need. Those two items are really great for staying out in the field. Engineers of course have other options.
Camping the Auction House
For anyone who supplies (or "plays") the auction house, there is a great little spot for Alliance players. Not many talk about it because it does provide a competitive advantage. The spot is in Stormwind and you can access your mailbox and auction house without running between the two. Make a macro to target the left-most AH vendor. Then hotkey an "interact". You can interact with her by banging on the wall -- while standing next to the mail box outside. It's... glorious.