Wow...this has to be a record for the use of "auto" in a thread!
Autoland isn't favored for routine operations because touchdowns tend to be rather firm
Landings, regardless what passengers and pilots believe, are SUPPOSED to be "firm". Endlessly floating the aircraft down the runway looking for a gentle connection with mother earth does not make a good technical landing.
So why do pilots take manual control of these really cool huge jets instead of relying on the technically flawless autoland system? Wouldn't you?
As mentioned before, there is no auto-takeoff system per se installed in aircraft. But there is a "takeoff" mode in some autothrottle systems.
The one I am most familiar with is the type available for the CRJ. When TAKEOFF is active, the autothrottle system reads the takeoff thrust calculated by the FMS. Once the airplane is lined up and the pilot hits the TOGA button(s) the power levers are automatically adjusted to the takeoff thrust. The pilot must still steer the aircraft down the centerline and rotate when appropriate.
At 80 knots, the autothrottle enters a "hold" submode until rotation when it enters the "CLIMB" mode and adjusts the engine power again using FMS calculated thrust targets.
The CRJ that I fly cannot autoland either- must be disconnected below 80 feet...autolands are not used very often-mostly for certification/currency purposes and in extremely low weather...typically have a bit more bump than manual landings.
The reason the CRJ can't make use of the available autothrottle system to constitute an autoland system is because the autopilot isn't capable of meeting the autoland requirements. So even if certification/currency wasn't an obstacle, the autopilot is.
If you want CAT IIIb capability though, all is not lost. A Heads Up Guidance system is also available that will give you this on a CRJ.
You also have to remember that if you autoland in zero viz, that's fine. But now what?
There has been a great deal of research done on autotaxi systems, but beyond a few airplanes and only one airport with the capability (Schipol I beleive) you won't find it.