Actually, there's a lot more to it than you would think. I personally only overtake if its completely safe and if I consider that I'm actually going to make some progress, over the years I've realised the futility of being in a queue of slow moving traffic and trying to leapfrog them one at a time. This is however a really good way to ensure that you max out the number of stonechips on your bumper, stress yourself out ,waste fuel and wear your brakes out . I very nearly came unstuck doing this some years ago when the car 2 in front decided to turn right without signalling. So I tend not to drop down several gears unless I'm passing a tractor or something doing 20 mph. I also don't think its a good idea to overtake a long queue of traffic doing 40-50 mph even on a dead straight road by putting your foot down to the floor and having a 20/30 or even greater mph difference between you and the cars you are overtaking. Self preservation mode kicked in quite a while ago for me .
Pete