I bet these guys do:
Ireland's 'LeBron James' of Microsoft Excel has won the 2025 world championship in Las Vegas.
www.bbc.co.uk
More broadly though, you don't need to know everything about Excel to use it. Most uses don't need the more obscure functions and work arounds.
I think one of the things about it that people here are critical about, is that it can be self taught. You can start making calculations with only the most basic of knowledge, and as your needs expand, you can find out each function as you go, and its all very intuitive. Of course, this can lead to bad habits, which can lead to the problems above. But also relying to much on pivot tables, which can cause so many problems.
Compare this with creating a database - I wouldn't know where to start, and I once went on a one day Access course. I just don't have the time to sit down and learn from scratch how to build one, and I'm currently looking at buying one for our site as our old Access database is struggling. The alternative is finding someone to make one from scratch, but I'm not sure our large company would go with that.