The main reason to file early is to head off possible identity thieves. And please understand that only the IRS controls the timing of refunds, and does not necessarily process returns in the order they are received. I am just a user volunteer, but know others who filed with TT's competitors who are also still waiting. The IRS received 35 million returns the first week alone, so there are bound to be delays.
Going forward, you can change your withholding so that you do not have to wait for a refund at tax time. Also see:
Tax Season Refund Frequently Asked Questions | Internal Revenue Service (irs.gov)
