I for one like microcline... when used with other microcline. I use it for decorative constructions and sort of wish I were more savvy and could render it economic for conversion into blocks. As it is, I take what I can get and just try to use microcline furniture next to other microcline furniture. It certainly makes a more interesting fort than endless piles of siltstone brown (I really despise siltstone...) or whatever flavor of grey stone is most common today.
Along with the also common and horribly clashing orthoclase, as well as less common brightly colored stones like cinnabar, petrified wood, and olivine, I also like it in mechanisms. It's nice to have the microcline lever, orthoclase lever, and so on hooked up to properly color-coded constructions. As such my outer bridges tend to be technicolor. Even if the bridges aren't, distinct levers is still a plus, since I tend to build lever banks. nice to not have to check my notes that the upper-left turns off/on the mist generator while the one next to it activates the horrific death traps: instead, the BLUE one activates mist, and the RED one kills things. Saves me a step when frantically trying to do something.