Coaches and buses generally run along the same routes, SatNavs would really be an 'over the top' toy. If I were doing something exotic such as driving to Croatia I would really want to ask about the route well in advance - where are the low bridges is a must! Speed limits, country laws, etc.
What I do is nothing like that - I'm just a put-out-to-grass-donkey, which is fine with me. I'm under-deployed but I'm happy with that, just hiding in a corner, enjoying the scenery at my own slow pace - although, of course, I am a thoroughbred racehorse and could pull long-haul coaches across Europe.
I do like driving long distances such as Finland to the UK by car. It's amazing to drive along empty roads right across central Scandinavia, mountains on the horizon, endless forest and mooses, waterfalls and river rapids beside the road.
4.5 years ago when I worked for a local cowboy for 3 months (all went well but glad to get away from him with his dodgy practices) I had his SatNav and played with it a bit. You can programme it to say you want to go from A to B and it will run you through the route - you can speed it up by various factors. I wondered what the route looked like when you go through long tunnels in Norway (longest is 15 miles end to end). You can also have it in different languages and for a while I drove with it on in Afrikaans.
I keep thinking it would be a fine thing to do this Summer, to drive our car to England. Am still thinking about this, although I know it is much cleverer to fly at 500mph across all the various bits of water. I have a load of books and DVDs which should really be taken to a charity shop in England, and a car would be the best way to shift 'em. But then, when you're feeling tired you can just have a snooze in a plane - you can't do that in a car when you have distance to cover. You can actually drive from here all the way to the French coast without having to drive onto a ferry, now that the Sweden-Denmark bridge has been built, and the bridges in middle Denmark.
I can't help thinking the Oresund Bridge was built in the wrong place, it would have been better Helsingor-Helsingborg, which is where ferries still run.