The N64 rumble pak also had a longer lever to the controller, making that greater weight even more felt.

The annoying thing, of course, was that you couldn't plug in a rumble pak and a memory card at the same time. There were third-party options available, but third-party memory cards had a bad reputation.

The Dreamcast solved this by having two slots. The VMUs were insanely cool at the time, and honestly still are. Some games used them in cool ways, such as Resident Evil showing your health.

I had an N64 memory card (if memory serves, a third-party/Mad Catz one I got for Xmas) but I can't remember ever using it for anything.