I have to agree with you. At least in my experience this seems true (with a few exceptions). I feel that devs that rely on auto-complete and such of an IDE are never really forced to know the libraries and code they're using. To me it feels like training wheels they never take off, and therefore can never move at full speed. But maybe it's just that due to the popularity of these IDEs, many newer devs are using them while older, more experienced devs are still using what they're used to.

Quick edit: I work with some junior devs who all use IDEs. It pains me when I ask them where some code is and they only give me the filename and not the full path. I guess this is because that is what is most prominent in the IDE.