It will feel different, but you will have plenty of low gears. The spacing between the gears is different, but it's just different combinations. I have an 11-32 11sp cassette on my Silque (Ultegra), and it's fine for the hilly area I live in. While it's true that you can add higher or lower gears to a cassette, you are talking about the standard 11-32, 11 speed that Trek uses with its new road bikes. They haven't gone to an 11-32 to make the gearing harder... that's not what average riders want. In order to get rid of triples and provide low enough gearing for recreational cyclists, this is what the industry has evolved into. When I built my custom Guru in 2011, I didn't have this choice. I wanted a bike with very low gearing, because I often ride with a loaded pannier to commute. I had a mountain bike rear derailleur/cassette with an 11-34 put on the bike. It is awesome, but it's a weird combo of components.
Don't get upset if it takes a bit to get used to the new gearing. When I got my Guru, my other road bike was a triple. Even though the Guru had lower gearing with a compact, it took me a while to get used to the different feeling of the spacing between the gears.