@maxdancona,
I still use the postal service and find it useful.
My rent check has to be mailed. It goes to one of those mailbox places.
My new lease is normally mailed to me and I must return it by mail.
My bank accounts still send monthly statements and other notices and those annual tax things for interest accrued.
Some people send cards occasionally.
For mailing a book, the post office still has better rates than other services.
As for those items you get, which are of importance, how do you suppose to have them delivered if the post office and postal service ceases to be?
What will you do if there is something which has to go through the mail?
There are methods to stop (or at least greatly reduce) junk mail. Look them up on the internet and join folks like me who have reduced the majority of that waste.