When I was writing c#, I did use visual studio, but since I'm used to developing in a terminal editor, all these tooltips and things are a little tricky -- sometimes they disappear, and then I can't get them back, etc.

But more often, when I'm looking at c# or c++, it's not code I wrote, it's not code I intend to change, it's code that's interacting with my code (written in another language) that I'm trying to see why it's misbehaving, so I can get the owner to fix it. I could be reading the code on GitHub or some other web view, I might have checked it out, but I have no interest in setting up a (probably new) IDE to look at it as the author would; I dig into too many projects to learn that many tools -- and deal with the upgrade cycle for them.

Sure, it would be useful to hover and get more information, but I'm used to loosely typed languages, so it's not awful. It's just jarring to see that the type information is apparently not important enough to write down the name in c++ or c# anymore.