Oh, no, I would definitely say improved.
My games are much, much better now than they were when I look back at what I did in my teens. My cringeworthy attempts back then are what they are - very basic attempts to emulate all sorts of ideas and failing spectacularly. DMPC's, railroading with the heaviest of hands, forcing outcomes, resolving adventures with NPC's, you name it, I'm very much guilty of it. I was definitely not a good DM back then. I might not be a great DM now, but, I'm certainly a hell of a lot better at running games now than I was back then. And a much better player as well.
The idea that roleplaying today, after years of indie games, examination by the likes of the Forge and multitude of others, and a bajillion hours of actual play is the same as it was in 1981 is, IMO, absurd. Of course it's different. The language we use is entirely different. The way in which we reflect on gaming is completely different, informed by years of experience it has to be.
To me, and I know this is going to get me in hot water, but, games like AD&D and certainly OD&D were barely role playing games. Hell, they were barely playable as games without a huge amount of effort on the part of the participants. So, of course role playing has changed over the years. I remember an Up on the Soapbox from an earlier Dragon magazine - I'll try to dig it out later - where Gygax was shocked by a polling done in the magazine where respondents actually felt playing in character was important to role play. And this was a post-3e Dragon magazine. So, yeah, it has changed.
What rules do you think you need to role play? It's not like we ever paid much attention to what Gygax said about how to play - we mostly just figured out what we needed to run our PCs, figured out how to determine treasure and looked up monsters. We never played D&D as an adversarial DM vs PC.
I realize many other people may have soaked up every word Gygax wrote, we never did.