I have a Gitzo G1348 (4 sections) as my "default" tripod; I am 6ft in height, and with an Acratech Ultimate on top, there is more than enough extension available when the tripod is on flat ground. As a result, I only extend the fourth (the thinnest) sections about 1/2 way. I often leave them like this, and only collapse the other sections, when out in the field. This gives be the speed advantages of a 3 section, together with the extra flexibility a 4 section gives on a hillside. Finally, when I pack it away at the end of the day, it collapses further than a G1325 would.
I carry this tripod in a cloth bag, whcih can easily hold the tripod even with the bottom legs 1/2 way extended (remaining sections collapsed). This approach has worked very well for me, but may not suit others.
BTW, my other two tripods are also 4 section -- guess I just like that configuration.