Breaks or Nah?

I've read a lot of suggestions for time management and productivity that encourage the pomodoro technique or working in timed spurts followed by a break. Getting started and task switching are the places that hardest for me, and I often skip the break because I'm finally focused and don't want to get interrupted. But when I do take a break or i get interrupted, I'll lose and hour or more before I can get myself focused back again. Does any one else struggle with transitions and/or inertia? Any suggestions or hacks?