close my apps, and files, and open other apps and files. I do this up to 8 times a day
I know exactly how you feel. My main (work) PC has as much resources as they let me buy and I have 2 other (lesser) desktops. I also leave stuff running on all of the 3 Windows servers I look after.
That way all my different 'roles' are just a KVM switch or Remote Desktop away.