Yes, if you're willing to stick to it - that's the hard part. There's nothing magical about it. You become better aware of your time and therefore use it better.
Fifty plus year's ago an economist,Cyril Northcote Parkinson, coined "Parkinson's law", it says, "work expands so as to fill the time available for its completion." In someways it seems obvious but the reality is that it's not so obvious since we don't recognize it until someone points it out.
Parkinson's law is what the Pomodoro technique is trying to manage for the individual as Agile is for project management. It does help but it's just hard to maintain over time.
The way to stick to it is to make it a habit. Start by making it a game such as how long can I last without failing. By the way you will fail. Track the time you lasted and then try to increase it for next time. Also note why you failed and find something to counter that so you're ready for the next time. Repeat until you no longer think about the process but it becomes part of your everyday.