This is what Elite is, though. You either buy into that or you don't -- it's the core, fundamental design of the game to have the gameplay be dominated by supercruise, and to have that be slow to give a sense of scale. That is the core experience that the game is trying to deliver -- galactic scale.
That's just like, you're opinion, man.
The core design of the game doesn't require HUGE super cruise journeys to work at all.
I've played a LOT of this game, and I can tell you, I have never travelled 100,000Ls across a system (well, since I tried it before), because there's nothing to do during that time. And I've enjoyed the game just fine, and played massive amounts of the content in the game.
If signal sources could be dropped into, and jumped out of without really losing much of your speed (drop out at high speed, get back up to the speed you were at in a second or two after coming out of one) then they could be things to do during the travel. Allowing the use of the FSS with throttle up would also help here.