The way I look at knowing how to drive a vehicle with a manual transmission is...Its better to know how to drive one, than not know how and some day be put in a position that you need to drive one in an emergency. An emergency is not the time to learn how to drive a manual transmission. Quite a few of my friends have kids that are now old enough to drive, and I taught them to drive manual transmission before anything else. If you can drive a manual you can easily figure out the automatic. Most of those kids own trucks or cars with manual transmissions because they're cheap, easy to find, and relatively less expensive.
My 84 Ford Bronco 2 I have no clue how many miles are really on it, but the clutch had been replaced at some point before I got it, tranny whines, but seems to be common.
My 2008 Toyota Tundra 4x4 5.7L has a 6 speed automatic and 67,000 miles of absolutely no issues with it so far. I've towed some pretty good loads with it and actually like this transmission. It will automatically downshift when in tow/haul mode to help maintain a steady speed up or down hill 5th/6th gears are both overdrive. Great truck other than once again no manual transmission available.
My 1988 Ford F-250 4x4 had a 3 speed automatic transmission and its currently pushing about 400,000 miles on the original 460 engine and original transmission/transfer case. No major components have ever been replaced in it, only things done are routine maintenance and transmission fluid changes every 35,000 miles. My aunt and uncle have that truck now, and its still running and driving great.
My 1984 Ford Ranger had about 176,000 miles on the original engine/transmission as well and all it had was standard maintenance as well. It also towed around a 16' travel trailer for 14 years and never had the transmission fail in it, it also wasn't electronically controlled like the newer automatics either, so that may make a huge difference.
My 1996 Jeep Grand Cherokee 4x4 4.0L 4 speed automatic had 227,000 miles on it when I sold it and it still had the original engine/transmission/t-case in it as well, and never had a transmission problem out of it either, and supposedly chrysler products were well known for transmission failures. Most of those failures actually were in V8 powered vehicles from what I can recall.
My 1993 Ford Tempo 3 speed automatic survived at least 130,000 miles when I traded it in on the jeep.
I've had a 2006 Chevy Cobalt 5 speed which had to be rebuilt at 15,000 miles but apparently these transmissions were notorious for having issues.
1999 Dodge Ram 1500 4x4 HD4500 tranny had a throw-out bearing failure which the bearing actually shattered and caused major damage to the clutch so it was replaced at 119,000 miles, other than that the transmission itself was great. Just the 3.55 gears sucked for towing.
1989 Nissan D21 4x4 5 speed had 319,000 miles on it on the original tranny/engine, I think the clutch had been replaced once, but other than that never had an issue with it.
1989 Mazda B2600i 4x4 5 speed 390,000 miles on it, and I was told it had the original clutch still in it, don't know if I'd believe that but I never had an issue with it, just a slave cylinder failure.
I've had several autos and several manuals, and I can say that I have never had a transmission problem other than the Chevy Cobalt POS which was a pile of garbage from day 1, not only transmission issues but electrical problems which would randomly leave you driving around at night and all of a sudden have no headlights, or all the gauges would drop to 0 while driving. That car was a nightmare.