The one thing to avoid is the macho roadie thing about huge gears.
Surprisingly the thing that singlespeeding taught me (in the brief time I've had one running) is about neater cornering and carrying speed. If you are going fast and cannot pedal back up to speed, then you have to work harder to conserve momentum.
You're right there mate - momentum and a bit of speed will often get you through and up stuff on a SS that on a geared bike you'd have been changing down for and thinking "am I in the right gear" and ending up not being.
I've got an example of somewhere like that on one of my local bits of single track - you drop down a rooty greasy off-camber section onto a fire road and then immediately turn right and downhill for about 25 yards to blast up a very steep 10ft bank. On a geared bike I never hit that bank as well as I would like to (always too low a gear, losing momentum changing or something....
) and I consider I'm lucky not to have failed to make it up. Suspension forks don't help either, as I can feel them soaking up too much energy at the transition.
But every time on the rigid SS is a blast - it seems so easy ( you have your gear and that's it) and getting some air at the top is just the icing on the cake