Crikey - I have actually been back Along the Central Line.
An emergency appointment at the dentist saw me heading back towards Northolt. So it was one stop Eastbound from South Ruislip, an un-enjoyable* 30 minutes in Northolt and then 30 minutes into the West End from Along the Central Line.
I waited no longer than 30 seconds for either train, the journey times were quick and each train was quiet. If only I could always travel to work at lunchtime!
The only problem with quiet trains is that they can't last for ever. If trains are consistently quiet, due to less people traveling, then eventually the operator will cut services. One should think before wishing too much for quiet trains - regularly quiet = uneconomic.
* I don't like going to the dentist, but do try to go regularly. Upon explaining the problem, my dentist looked in my mouth and said "Oh, that's not too bad. I can fix that". In and out in 10 minutes. Fortunately, not back to my roots. Result!