So I just thought I'd mention this...
I have long been one that has had the insufferably long initial load time issue. I mean teh problem where your first game load after boot can take several minutes and often results in you being disconnected by the time you enter the world. I never worried to much about it since second + loads worked perfectly well, but on a whim I brought my laptop to work and did an uninstall/fresh install.
The result has been that the problem has completely gone away.
So, I know there is a population out there with this problem, and doing a fresh install can be a highly time consuming task, but since it worked for me, I thought I'd share that data for you to make your own decision.