Gmail spam filter works well for me.
I never open Spam just delete all.
They're deleted after 30 days anyway - same as deleted emails in the "Bin".
I do nothing - it takes care of itself 
I always make sure there are no emails in Spam that should be in the Inbox, it does happen occasionally.
Yes i do the same, usually in:spam [myname] since I get around 50 or 100 spam per day but from many accounts to my gmail account
BTW from time ago i am using some of those 10 minutes email for register in some annoying pages that I know that they will send me spam (why they need my email :/ )
But now i am using something different, the webpages is yopmail.com is a...
Disposable, Anonymous and Free email address. Alternate E-mail Address (Inbox alias)As you know YOPmail inboxes are public and password free. Hence it is suggested that you choose unique or difficult inbox names. However, some users choose simple names for the sake of convenience. YOPmail is aware of this and is concerned with such user’s safety.
Thus, each YOPmail inbox has an unique alias as an added security feature.
Even if you choose ordinarily named inboxes, YOPmail generates an unique alias address for you, visible in your real YOPmail inbox at the top. Using the inbox alias adds to your privacy, as any email sent to your YOPmail alias is Auto-forwarded to your original YOPmail inbox. Anyone checking YOPmail inbox with your Alias will always find the mailbox empty! This way YOPmail address is never revealed and your privacy is protected at all times
You stay protected at YOPmail always!
I like this system when you don't want to use your real email or identity