I've set up a user account for specific emails. When I'm away from home it's nice to have all of my emails forwarded to a single account. I generally forward and keep a copy, but regardless of what you say about only going to my inbox, email in the Spam folder gets forwarded to my spam folder in GMail.
I report all email received through SPAMCOP, and at times I've mistakenly used a forwarded email in GMail to report through SpamCop.
I don't use Webmail for viewing email as I prefer the security, control and backup using an IMAP client.
When I go to the Settings | Forwarding area of Webmail, I use Forward and keep a copy.
Finally, I did not receive any emails to this post, and by chance happened to see a reply listed in the main forum. I do have this feature turned on.