Get a full-fledged IMAP experience on your phone
Gmail is a web-based service, but on the backend, you can use it like any other standard (IMAP) mail provider. With K-9 Mail, you have full access to all the folders in your Gmail account, and you can sort, filter, download, and rearrange those folders however you’d like. You can flag messages, set up PGP encryption, export messages to your phone storage, and the list of features and options goes on and on. The one drawback is that it’s not the most forward-facing of app designs, but it more than makes up for the lack of polish with a solid core.
It’s probably the biggest change you can make to your Gmail experience on your phone, but it’s not limited to Gmail. The open-source K-9 app works with any IMAP, POP3, or Exchange 2003 /2007 email provider, like, say, the address handed out at your workplace.