We don't do our own repairs now, being old, arthritic and better off - and not having kept up with modern mechanics - we have servicing and repairs mostly done professionally.
In the past, from almost fifty years ago to about ten yers ago, we did do everything on our vehicles. The pit was absolutely invaluable. But circumstances change.
You only need a jack for that, not a pit nor ramp.
We used the pit for more major operations such as engine/gearbox removal and replacement, clutch repairs, other things which were more easily reached from underneath than on top. Remember, we're talking older cars here.
It's an individual choice, we never thought about it until we moved into this house which had a small pit in the garage. a neighbour, a professional mechanic who did stuff for himself at home, asked if he could use our pit. We were so impressed with the accessibility and ease he could work that we began to use the pit ourselves.
er? They still have to be picked up ... If you mean that they dropped into the pit from above - well you keep the pit covered when not in it.
Mary