"Grind" might be a strong word, given that it takes maybe a minute on average. (Sure, if you are scanning a system with 50 bodies it will take longer, but those are rarer.)
I know, grind is relative, but in the end, it's a simple and monotonous mini-game that you still have to complete to see if there was anything worth doing it for.
A minute on average also adds up. Consider that jumping into a system takes minimum 30 seconds, then there's time spent fuel scooping and lining up a jump out. We could say that's a minute too, but at the very least, it's a comparable time. So, if you play for an hour, and explore 30 systems then, half of your time is spent in the FSS. And it can all easily turn out to be a waste.
As I mentioned before, the FSS was explicitly designed so that you could
jump into a system, look at the bar, and jump out if there's nothing of interest to you there. This was what the developers at the time said. Even when that wasn't entirely true at the time, as lots of explorers were interested in things beyond "there's an ELW / WW in this system", it certainly broke entirely with Odyssey:
if you're looking for thin atmospheric planets, where the expansion's content is, you can't see those at a glance.
Look on the bright side: When you scan the system with FSS you get a bonus when reporting to universal cartographics.
Yeah, a whopping 1,000 Cr per body. That might as well not exist.
I've noticed that I spend 99% time while exploring while either staring at hyperspace or in FSS. Not exactly fun, although I've already explored smth like 4k undiscovered previously systems so...
You know, this was another problem with the FSS that used to be better before it. You looked at the system map and how planets (stars, moons) actually looked. This was swapped for a blue overlay, with grids, and you can only see one planet at a time. Even then, they aren't rendered entirely as how they'd look.
I know, it's not a big deal for most, but it's still yet another thing that could be improved, for everyone.
Well anyway, I digress. The original question was whether you can use anything other than the FSS to determine a planet's type and then fly there, and this has been answered: you can't, not in undiscovered systems.
You can see visually that there's something there as you fly around, but you'll only know what it is if you fly there. (By the way, before, you'd start scanning bodies from a distance, so you only had to fly towards it, not to fly all the way to it. The DSS could be engineered either for longer distance or for faster scan completion.) This is it.