As a newbie, I've been pretty committed to sending Geo teams around and it's been a very small percentage chance. The larger bodies can take forever (I've spent many months on Mars), but also seem to be either Team Skill based or luck based. I've had some pretty quick team scans on Mars or Venus, though that might have been three clicks that went the full 30 days. I'm reaching the conclusion that unless it's a body I plan to mine regardless of team finds, or maybe one that is borderline, it's probably not worth my own intervention time except to buff up one team with skill up chances.
As for Aliens, I hear you. My first try on the laptop (still only played 60 years in my first ever game) I had aliens some blow up my survey vessels one system over from Sol. I'd taken forever to do the early stuff even with a TN start, and my local mineral finds were poor. So I walked away, but kept the game to come back to when I'm a bit less incompetent. The only warships I've ever built I called BS as they were strictly to mollify the peasants.