Some shower gels go with the fragrance. For example, I have Eau Sauvage shower gel, M7, Sung Homme, Fahrenheit, Body Kouros, and Versace L'homme. Whether they actually help extend the life of a frag is a question I'm not sure I can answer. It may be a nice way to begin (or end) a day, with the fragrance in the shower/bath.
Note that some gels don't really seem to match up exactly with the fragrance. In fact, the M7 gel (per their website) has a ginger note. I don't think M7 EDT has a ginger note in it. I used to have Z-14 gel, and it was pretty bad; I tossed it.
I don't use commercial gels which have a strong fragrance... getting something like one of the Old Spice gels would probably clash with the fragrance I chose to wear.
I do use something pretty mild - Dove Deep Moisture Body Wash, just really smells like soap, not heavily fragranced. I also use Dr. Bronner's Castile Soap, it is a very fluid liquid, not a gel though. The Aloe Vera Dr. Bronner's is pretty neutral, but I have used the Dr. Bronner's Peppermint and it did not clash.