I thought I would be. I really did. The new 3.5 releases were pretty boring, other than one or two lines here and there. Last spring, I was cheering for 4E to be announced so those one or two-off bits wouldn't mount into something big that bugged me.
Since then, I've discovered two things. One of which is that 4E really, really sounds like I'm going to like it. There went that plan.
The other is that there actually is a lot about 3.5 that bugs me. Prep time is killer -- as much as any other game I've ever run and more than most. I like a lot of varied concepts like shadow magic, binders, combat styles, swashbucklers, etc. that require using a huge array of books in D&D. Plus, there are a lot of things that are implemented just enough off as to bug me -- Vancian slots, Bo9S maneuvers, swashbucklers, rangers, etc. Not to mention the Christmas trees, game-wrecking magic, and "sweet spot".
I've decided that the biggest benefit of 3.5 was in running published modules that use the framework. There are a lot of those, and many are very cool.
Being a homebrewer, I don't really get so many of those benefits. Instead, I get a game of exceptions (almost every feat is a unique way to break a rule) that is very high maintenance and lacks flexibility in the areas I most want it.
I'm going to finish up my current campaign without converting. Then, I'll check out 4E. At that point, I'll either move to 4E as my default fantasy rules or Hero system. Hero vs. 3.5 isn't even a contest.
My 3.5 PHB, PHB2, DMG, MM, and Compendiums are probably the most I'll keep of the three dozen source books I currently own. Those will be held just in case I want to run Savage Tides, Ravenloft, or Rappan Athuk. Or, in case the other GM in the group wants to run his Castle Greyhawk.