Most folks I know, do it as a labor saving device. Most folks will strip, run through with a cleaner, and then relube with an oil bath. No detailed scrubbing involved. A fellow armorer tries to run his stuff through once a year - it's not perfect but it solves 95% of the clean/lube problem for very minimal labor investment.
I had a Spaulding class coming up and wanted a clean gun. From start to finish I was done in less than 30 minutes.
I know one agency that gave up on its guys cleaning their Glocks. The armorers can run them in the ultrasonic once a year and keep everything working.