For me, "nothing" is rarely true. When I've had to learn a tool that operated in a different way, I've often come away realizing that I could think about a common task differently, or that there are capabilities I didn't realize I wanted.

I this case I'm thinking of domain-specific tools meant for creation or curation, like an IDE, image editor, word processor, etc. That wouldn't apply to bureaucratic paperwork-type tools, where learning the site is typically a one-off and is pure waste.