If the predictions of the proliferation of house rules come to pass, I am not looking forward with having to learn new rules every time I play with different people. That could be an even bigger blow to Monte's concept of mastery than the way the changes were made between 3 and 3.5.
Anyways, I don't like using miniatures. For those who wonder why, for me it interferes with my imagination. I like to imagine the battle as fluid and action-packed. When it's run on a battle mat two things happen:
1. Your imagination of what the actors look like are effected by whatever miniatures happen to be on hand - and by necessity they very often aren't anything resembling the creature they are supposed to represent.
2. Miniature combat accentuates the static turn based nature of D&D combat. It's harder to imagine everyone moving and fighting at once - the chaos of war - when you see them in front of you moving one at a time and waiting for each other to move.
Yeah, I can ignore these things, and of course I don't assume that other people should agree, but since someone was wondering earlier, this is why I, personally, prefer running it without minis.
Playing with minis just seems more like a video game or board game to me, rather than an act of imagination.