It has worked well for me, in conjunction with the mantra: "Every job is training for your next job."
When I switched career tracks, my first job in the new track was very much a "fake it 'til you make it" situation. On one hand I didn't do very well, and it only lasted about a year, but on the other hand I was able to learn enough from it that I was very successful in my next job after that.
Every employer is an opportunity to learn about new things -- how your coworkers do their jobs, why the company does what they do, the technologies used by the company, the external services the company depends on, etc.
The more you learn, the greater your potential for workplace success. It's not the only factor, but it's important. It's all good to put on a resume, too; prospective employers love to see a diversity of skills.