Not that I'm saying they fixed the problem, but I did notice a difference once I got access to those updates. The first thing I did when I updated with the patches was try out my very first game, which had a problem with a dragon's body not disappearing after I murdered the crap out of it (quite awesomely, I might add), but also not being able to burn the stupid beehives during the Thieves Guild questline. Both of those problems were solved upon loading.
But, I do see a lot of lagging problems still, but not like before. I turn off auto-save, so that doesn't freeze me at all, except when it auto-saves for whatever stupid reason it does (like arriving at Solstheim). I also keep a lot of saves off my system. I don't know if that actually helps, but I do it anyway and I at least imagine it helps.
I've also noticed acquiring a lot of crap to sit around, while fun, hurts gameplay. I read on a wiki that hoarding a lot of crap in a chest creates a problem. So I don't hold on to stuff like I once did (like the silver swords, so I can sell them at full price later on). But it does make me wonder if Hearthfire becomes a problem because of this.