Bookmarks aren't that necessary now that destinations are remembered between restarts, just plot a 1kLy segment, and when you arrive do the next. It's not too much of a height difference either, so it's pretty straightforward once you get the hang of it.
If you freehand your travel though you'll get more discoveries along the way. At ~30Ly jump range, a run through uncharted systems with honks is worth around 10Mcr.The bookmarks are also for the trip back, and also in case of making several journeys back and forth.