I don't use the driving line and never have from the day the game came out. I never used it for FM3, either. The driving line is one of the most unrealistic aids available in either GT5 or FM3, and oddly it's a crutch that many allegedly hardcore racers are comfortable leaning on. It's funny how they'll brag about how hardcore they are with their manual transmissions, no TCS, ABS, et cetera, but then they use an aid that's far less realistic than any of these things (at least automatic trannies, ABS, TCS, and so forth do exist in the real world).
If people need the line to help them, that's fine. More power to them. That's what it's there for: to help players of a lower skill level. I just don't want to hear people talk about how awesome they are if they're still using the magic line. If you're using the line, you're not hardcore and you're not great. Actual top players can put in those great lap times without the magic line.
"Oh, but race lines exist in the real world!" Yeah, as something that drivers figure out for themselves, and not as something that magically appears glowing over the road surface and color-coded to indicate where to mash the throttle and where to brake. I've watched dozens of racing series (real life) and never once saw a magic blue/red line glowing across the track showing the drivers where to run and where to brake, or a red/orange/yellow/green one (FM3).
As for the map, it's still there on my screen but I don't actually use it for racing. I've got the tracks down and just don't need it. I just never turned it off (never checked to see if you can) and just don't care since it's not in my way.