Would you say you've improved at doing this over time, or do you think your level of skill has remained relatively constant?

I couldn't really say. Back when I read OB, I'd often think, "Yes, that's a typical OB title", but of course I knew I was looking at OB. When the sidebar blogroll was introduced here, I realised that I could still tell the OB titles from the rest. The "X is not about Y" template is a giveaway, of course, but Hanson hasn't used that for some time. SSC tends to use more auxiliary words, OB leaves them out. Where Scott writes "Framing For Light Instead Of Heat", Hanson would have written "Light Not Heat", or perhaps "Light Or Heat?".