After having played for a couple of hours that way, I wonder how people can handle playing MMOs on a laptop long term.
I can't possibly be that old, but my hands were cramping after a pair of battlegrounds. And if I didn't have a wireless mouse, I don't think I could have handled using the trackpad at all.
The minor annoyances of dealing with a new OS (Win 8 in this case) I can handle in stride. After all, I work in IT, and I know a new OS means some bugs in the system as all of the other apps get stressed in ways that beta testers never seem to get around to. You just check frequently for patches and move on. Considering my wife isn't cursing up a blue streak like she does when she tries to use my work laptop, I'll take that as a sign of approval.
However, one minor annoyance that I did find was that when I installed WoW and logged in, it wouldn't let me jump to the server listings directly. I had to first allow the game to select a server, and then I could back out and find my usual haunts. It would seem to be a minor thing that on a new install the game would check to see if you already have toons available, and if so it would allow you to select the server. I know it used to do that back when the old machine lost a drive and I had to replace all of my apps (that'd be late Wrath - early Cata), so Blizz must have made a conscious decision to change the opening sequence into this server-selection-on-rails system.
Still, it was good to be back. I've got several days worth of downloads ahead of me, but at least I can lurk around Warsong Gulch once more.