HaHa... not crowd wise ;) - nothing beats Mumbai railways for that :)
But there were quite a few interlinked lines and the map wasn't super easy to read, to understand what to catch to get where. But if you can familiarize yourself, and are clear on where you want to go - there is no problem at all. There's lots of steps though, which was a problem for me coz of Dad.
That apart - its super efficient. I'd just be clear on how to read the maps (which you get at every station) anyway. Read up at home - plan your day properly, and all is cool.
The museum touching stuff was fairly dumb on my part :). TBF though, I touched it really really really lightly - just took my finger very near the surface, but that was wrong too obviously. We learn.
I don't think I did too many museums in Paris - most of those were in London. RED in my sheet means I didn't visit those places despite planning to do so.
Hope that helps.