You think the guys rushing to SagA and BP to put 'first discovered by' were checking the scenery?
You could not even scan for planets in the first version(s). You had to fly in circles with increasing radius around the sun to even find planets
Discovery Scanners were in the game since the Gamma headstart launch, so not really. The Explorer starting loadout (available to Kickstarter backers at 70 GBP and above) included an Intermediate Discovery Scanner, so yes, you could scan for planets.
Perhaps what you have misheard or are misremembering (I've no idea when you started playing, and your profile here is set to private) is that the Basic and Intermediate Discovery Scanners had limited range, so if you wanted to find planets beyond them (500 ls for the BDS and 1,000 ls for the IDS), and couldn't yet purchase an Advanced Discovery Scanner, then you had to rely on parallax to spot planets, or just fly around in circles (which was easier but much more time-consuming). After all, the ADS cost 1.5 million Cr, which was a significant expense at the time, especially if you relied on exploration for your credits. (At launch, an ELW would be around 30-35,000 Cr, then it was doubled in ED 1.2, and stayed that way for two years, until ED 2.3.)
Zulu Romeo took the starting Explorer loadout, so he only used an IDS, but he was racing to the centre anyway. Erimus Kamzel flew an Asp Explorer to Beagle Point, much later than that, but he wasn't racing, and I'm pretty sure he used an ADS by then: after all, the Asp Explorer wasn't a cheap ship, so since he could afford that, he surely could have afforded an ADS as well.