Visual C++ 6 was the first C(++) compiler I used. I'm fairly certain it had auto completion (Intellisense).

Casey Muratori would point out the debugger ran faster on hardware from the era than modern versions run on today's hardware, though I don't have a link to the side–by–side video comparison.

Edit: Casey Muratori showing off the speed of visual studio 6 on a Pentium something after ranting about it: Jump to 36:08 in https://youtu.be/GC-0tCy4P1U — earlier section of the video is how it is today (or when the video was made)