It is a useful work around but it should not be required. I got out of the habit years ago when this was fixed in the old system..
Seriously, log out on purpose then go to
User CPYou'll get a login form in the main panel that includes the "remember me" option. Tick it, log in and you are done. You won't get logged out from that machine again until you decide to, even if you log in from a different machine during the meantime (unless you explicitly log out on the different machine, that is).
If you do get logged out again, it's because something has thrown away your cookie.
Trust me, I was logged in permanently from my home machine since the new site went live. I've only ever logged out recently to test stuff.