I've seen a lot around LHS 3447 and Eravate but since that's the starting area, it's to be expected.
I was so overjoyed to see one last night that I pulled him out of supercruise to say hi, then went about my business.
But if you have over 100,000 populated systems, and you estimate that a million copies of the game are out there... that's 10 people per system if you imagine an equal distribution. Not everyone is playing 24 hours a day, so imagine one third of those accounts are dormant and the rest are playing for 1 hour a day on average.
The chance of seeing another player when you go about your daily business is actually quite small, but the chance is vastly increased if you set about your business in a conflict zone or highly trafficked area.
I think the take-away thing here is that it can be a very solitary game, but only if you want it to be!