In my experience (12,000hrs 737, A320 and A330) autolands are very rare. In fact you often have to do autolands in good conditions just to keep in practice with the procedures. Many airports do not have the capability. It is not just the airport having an ILS it has to be at least CAT II accuracy and the holding points have to be set back from the normal holding points. The Airbus will do a good (practice) autoland on a less capable ILS but the 737 is more agricultural.
Any aircraft taxiing close to a runway which is being used by an aircraft on the approach for an ILS could effect the ILS beam. Therefore in good conditions you can do practice autolands but you may have to throw it away and land manually if the ILS is effected by taxiing aircraft.