It has been my experience that the long and low posture works particularly as a training device to lower the center of gravity and train leg strength. Fights, however, seldom occur in areas where there is enough room for the sort of long-range postures we would like to do from the form. However, the essentials of rooting do not change just because you are in a higher posture (hence the effectiveness of the Zheng Manqing form, and the Wu school, both of which use relatively high postures and short stances).
Thus, to balance training with reality, there are a number of things I do when practicing:
1) full form in a wide-open space, where I can do the whole routine at a low posture and with long stances;
2) full form in a smaller space, where I can practice remaining stable regardless of the higher posture, and where I can work on adapting the movements to shorter-range technique;
3) practice the shorter forms from the Wushu repertoire (like the 8, 16, and 24 forms), because these can usually be done in a confined space -- the 8-forms was designed specifically for use in offices, and is easy to practice on both sides; the 24-forms works on a linear model, first to the left then to the right, so it is doable in a hallway;
4) practice simple combinations, which can be done in a confined space (like Grasp the Bird's Tail, or the sequence from Raise Hands to White Crane...) -- which, as a martial artist, helps solidify and internalize these movements.
I hope that helps.