I can scan a system with a single star and 20 planets in the time it takes the kettle to boil. Multiple stars and systems with bodies way off the ecliptic are what usually slow people down, I have some interesting orrery shots of strange systems, maybe I shoud start a thread, your strangest system in orrery, in fact I will...later! A lot of it boils down to control, I have the entire FSS set up on my joystick using thumb hat, twist etc, it's like a speed typist, get controls set up right and you can flick through like anything. One of things I think a lot of people make a mistake with is waiting until the full body information is downloaded, you don't have to sit waiting if it is an uninteresting body. Zoom in, no locations shows immediately, you can tell size at a glance, you already know if it's going to be a possible life bearing or WW/ELW from its position on the frequency scanner, zoom out immediately, go to next body, all the information will finish downloading as you checking bodies.
But it takes practice, and sorry but the occaisional explorer, people who just pop out of the bubble every now and then, are simply never going to get that good, just like I will never make a combat pilot. But that's not a negative, it's a positive, it means there's now a skill component to exploring just like there is to mining now, and has always been to combat. I have spent the entire beta practicing with the FSS, system after system because I want to be well prepared for when it goes live, I have found Lagrange Clouds and other new features I haven't revealed yet, I am excited by the changes. Yes I may lose all the data and first discoveries I make in Beta but the practice is well worth it!