Never had Scalextric. Bought a set couple of years ago, and a mate kindly gave me a load of extra track.
Sits in a box behind the sofa. Had it out about 3 times, for just a few hours.
I had very similar experiences. Always always wanted one, mate had a Race & Chase when I was a kid and it was rad to the power of sick.
As “adults,” another mate bought a Scalextric a couple of years ago. It was a banked figure of 8 track which could be raced by holding the throttle all the way in. We went “mm, this is good” and put it back in the box never to be seen again.
I’ve idly wondered since whether the Micro Scalextric might be a better proposition. The full-sized system just seemed far too big.