I never use these buttons:
How can I make them go away?
Short answer: You can't, those buttons are part of the UI.
Long answer: There's a couple of options. Shotwell is open source/free software, so of course you're welcome to download the source and modify it to suit your needs. You could also file a Shotwell ticket for a preference to disable that toolbar. It's probably not a feature we're likely to add unless there's more demand for it.
You can file a ticket here: http://trac.yorba.org/newticket