I feel like non-sexual brainwashing is severely under-rated. I've had brainwashing plays (as tist and subject) where NOTHING sexual happens yet it can be some of the deepest most wonderful trances and programming ever.
Maybe you don't need to mindlessly edge yourself into oblivion that day. Maybe you just need your brain off for half an hour after a long day at work. Maybe you want to be motivated to get those damn dishes done or to fold the laundry properly. Being brainwashed into a helpful task-drone can be a very nice way to do that!
Maybe you don't want to be thinking about all the crap you have to get done. You just want to turn your mind off and be reminded what a good sub you are. How well you obey. How easily you comply. How wonderfully deep you can drop even without a goal in mind. Dropping purely for the feeling of dropping.
Perhaps you just don't want to be human for a bit and want to imagine life as a happy cow in a field or a dumb puppy being petted. Perhaps an object is even better for you, take away the stress of humanity by being a Fembot/Himbot/Thembot or whatever you wish. You can forget about human stresses and just carry out your programming.
For the 'higher powers' lovers it works even better. You don't need to be mentally fucked or masturbate yourself silly when service is purpose and obedience is pleasure. You can spend your time happily answering your programmers questions and performing your duties without so much as undressing.
So yeah, not all trances have to be sexual!