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I mostly program in C#, python and JavaScript. By mostly I mean slightly more than half the time. The rest is old C++, old Java, old Perl, BASH, etc. I gave up a long time ago trying to remember the APIs/Libraries for all of those. Most programming is doing something slightly different to some other thing you have done before. I make it a point to remember how I do things, so that no matter the language, I can get it done. This also helps tremendously with estimates.

Also a generalist.

I do follow the same approach.

As Nicklaus Worth stated, knowing algorithms and data structures is more relevant as specific language features.

I'm in your category as well. An unfortunate side effect of this is that I think I'm kind of terrible at technical interviews though.