I haven’t interviewed anyone in years, but when I got an informal one liner thanking my for my time I would find it a polite gesture, and I used to do that myself when I was on the other side of the table.
Something like: “Bob - it was great to meet you today, thanks again for your time. Look forward to chatting more soon”.
If someone sent me an over the top, obsequious, unctuous long mail, that would be off putting, of course.