Best means of vertical movement

after taking a long break and waiting for things to update into a more stable sense, i came back and remembered why I had trouble in VH3

The Verticality of the maps are huge time sinks, and i feel I fail more often than not trying to navitage a single room if I accidently fall down to the lower levels.

What is the best means for traversal in the vaults? Builds, items, perks, whatever.