The game has proper navigation between planets, you gravjump because space even between planets are huge and nobody wants to travel multiple hours, days, weeks or months (depending how close to the limit of C your story allows) in empty interplanetary space from planet A to planet B in the same system.

The problem is how is presented, the loading screen play a role here too. If the gravjump was only the animation starting then you exiting without the black screen, or a more lengthy jump put you can move in your ship while the jump is happening the amount of loadings would not be so noticiable.