Is it possible that a lot of the improvement with the inflight experience is facilitated by reduced traffic and increased block times allowing for generally easier and lighter operations? Then again I generally think UA is fine until something goes wrong, so I am not as naturally talented a reviewer as many are.
When it comes to conversations, I am not a very social person (don't go clubbing say, and am married) but for a young person (under 30) I have always been the kind of older folks find easy to talk to. I find it has been very rewarding to engage my seatmates in a bit of conversation. My strategy is usually just to at some point during boarding ask something like "headed home?" or "headed out for business?" depending on my best guess. Usually we have one of those in common, or that way we find out a bit about each others occupations and why we are traveling. I do it in a super casual way and that way there is no real burden to keep the conversation going. I am always surprised how often on a long trannscon (SFO-BOS usually, which is a great route for interesting people I think in E+) it germinates into an interesting conversation. I have met some real interesting people, interesting businesses, fellow engineers, high-up political people, etc. and learned stuff about the world I wouldn't have otherwise.
Then again, sometimes you get the seatmate that starts hugging you saying she is afraid it looks like the plane has stopped moving when she looks out the window. Then you have to have a whole different type of conversation ... about how a plane works.