I went from a Trek Navigator to a 7.2fx. The fx is definitely lighter and no front suspension. That suspension will slow you down! The difference was amazing to me! It's the perfect bike for short rides and commuting, which is what I use it for. I also finally got a road bike, and love it too, but will never get rid of the fx. (I actually sold my first fx when I started riding my road bike, and soon regretted it, so now I have a 2008 mocha 7.2 fx and will never ever part with it. (It's my utility bike). I have pedals that flip from spd to flat so I can just hop on it and go to the store. For short trips, I prefer the flat handlebars like you, but get rid of the front suspension!!!! I can also ride the Katy Trail with it, which I can't with my road bike. Even if you decide to go to drop handlebars and a skinnier tire, you can still use the fx like I do. It's my trusty knock-around steed. I tried other fitness bikes when I decided I wanted an around town bike again, but the Trek seemed the best fit for me.
Claudia
2009 Trek 7.6fx
2013 Jamis Satellite
2014 Terry Burlington