> which is not where you want to go

Oh the horror, you might have to walk a couple of minutes (probably less time wasted than circling around to find a parking spot, and then walking from it to your destination).

> at a time that is probably not exactly when you wanted to arrive

Yeah, no. Trains in properly developed networks are extremely frequent. At the off-peakest of off-peak (Sunday late evening), the RER near me is every 15 minutes. During peak hours it's every 5 mins.