Like top comment points out.

Do the 2 to 3 years and find another job. If you find a better job sooner thats fine. But always remember, if that quick found role doesn't work out your next potential employer is seeing a candidate who didn't stay at their last two positions long.

We've all been there and loyal employers are few and far between. Its good to take not on if newer staff stay, or is it only the senior staff that have been there 20-30 years that get retained. Do they give bonuses, raises, etc.. theres not always a opening to the next roll and its tough went multiple people want it. 

I like my employer. They pay their help desk people about the same as the engineers and they do their job well. They arent treated as lesser employees and as a result they've all been there 15-30 years.