You could use the recently new change account feature where you open Steam and all your accounts appear in one window and you're already logged in to all of them and you just click on your profile icon and it opens that account and when you are ready to switch you click the drop-down box next to your username and select "Change Account" and after it closes, the window with the profile icons pops up again and you can select another account and you don't have to use a password each time. Make sure you tick the check box when you confirm the request to change the account. It makes it much easier to log in and out of different accounts.