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If it is evident that the vehicle hasn't been used too much recently I'd opt to keep on using it and see if that helps or alternatively it develops into another more obvious problem.
From the list of things that you've done you've done most of what's to be expected.
If the surging is really causing trouble and the revs keep on rising (!) think about things that could cause this to happen such as
1) Messed up cruise control?
2) The ADA
3) Sticking rack linkage / poor accelerator spring / floor mat stuck under the accelerator pedal (<= now that's a classic)
4) If the surge ONLY happens with a gear selected (automatic gearbox) then you need to consider something's up with that...
5) Air conditioning - even if it doesn't work is the mechanical connection to the compressor still there => remove the belt
6) SLS pumps - does the surging coincide with pressure fluctuations in that system?
7) Whilst power steering doesn't soak up too much power from an engine the "free-running-ness" of all pulleys ought to be checked
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