I’ve used neutron boosting a fair bit to cross the distance going out of the Bubble to get to unexplored space faster, here and there. Or to come back to it. Sometimes, for those journeys to the crystal shard sites(which is a rare visit in and of itself anyway). And, once, the ‘highway’ when I went to Colonia for a second time prior to… what was it? Might’ve been update 15, or just after it. Don’t think I went anywhere pre-U16.
In the Bubble? Only very rarely have I used white dwarfs(so far, if I did, without getting myself killed). On some occasions, FSD synths, but the only time I’ve actively relied on them was visiting some giant stars underneath the Bubble, or going through the weird low star density border region of Kepler’s Crest and the Sanguineous Rim.