That is exactly right. The exercise extends into the explosive entering that is typical of Shodokan. You want to get used to keeping your feet close to the ground but not tripping up.
Office Aikido, or climbing up the mountain Aikido (Peter G. may remember), or in the park, or or or is very important to developing ones Aikido. Get out of the dogi and hakama and off the mat - opens up a whole perspective.
My understanding of the sliding of the feet is to keep the feet as close to the ground as possible to help maintain or recover your balance. I would say you should lift your feet as high as necessary to avoid obstacles but would not practice lifting the feet too high if not necessary.
Someone with more time in Shodokan than I may have a better explanation.