I have an '85 steel, Columbus SL. No rust. Light, fast, agile, balanced.
I have an '86 aluminum. Tange. Uh, no rust. Lighter, faster, agile, balanced. Needs a CF fork to have manners, though.
I have an '88 carbon fiber. Tange. Uh, no rust. Noodly, mainly due to an alloy fork.
I have multiple Tange frames from about '84 to '92 (OS). No rust. Light, fast, agile, balanced, and smooth.
I had a Ti frame (Douglas) and traded it for a "new" 1997 carbon. Very light, very fast, twitchy agile. Smooth not.
I only have one bike over 22 lbs and one over 21. Weight is not really an issue.
Nothing rides like Ti, but I'd have to have one of my steel bikes replicated in Ti to get the fit I want.
Steel is still my preference. I tried CF forks on 2 or 3 of them and went back to the steel forks.
When I'm riding, I want the bike to "disappear" and just focus on riding and shifting and braking.
That includes when I look down and see plastic. It's great stuff, just kind of unnerving to an old guy.