If your browser does not save cookies or name/passwords then it may be a little more work.
Otherwise, let's say the forums were without passwords. Imagine that chaos.
Bob
Why do I have to log in to every forum I access
I even have to log in to the ones I already have log in and try to revisit ????

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic