I don't use Microsoft IDEs often, but have had experience with them many times over the past 15 years. And every single time, intellisense would freeze, get confused, or just stop working completely. Not once in 15 years have I had a passable experience with it, so nowadays when I'm in Microsoft land I always immediately disable intellisense before I start working.
Visual Studio Code on the other hand is just fantastic. I was a hardcore emacs user until I switched to VSCode as my main editor a few years ago due to the crazy good auto-completion experience.
I had the privilege of chatting with the VSCode booth people at PyCon a couple years ago. I was waxing enthusiastic about some feature or another and one of the other people at the booth spun around — “I wrote that!”, and then I got to tell him how much I loved his work. That felt great.
It's good to have a way to specify when you're talking about the former meaning and I do not know another term for this than "intellisense".