No I don't think it has helped my skills at all. In the rare one or two cases in my career where I've needed an advanced algorithm, I had plenty of time to look up the best way to do it online.

I think it is important to know WHEN you're facing an algorithmic problem, and to be able to generalize your problem enough to recognize what kinds of algorithms might apply. But leetcode style questions as currently posed go way beyond that imo.