And...aw... Bugs is one of my favorite episodes. The episode itself is *really* really lame as far as the bugs and all of that go, BTW. But this episode has Sam and Dean having important conversations about their father--and their different impressions of him. Maybe you could find a transcript, although the angst is good, too. Maybe you could skip over the bug parts and watch the rest? hehe That's what I do with gross stuff, because I don't like gross stuff.
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ETA: I'm reserving judgment on season 4 so far, but the first two episodes have been good, IMHO.