I asked a Lenovo rep about this once, and they said that the drives they purchase for their laptops are tested to support more parks in its lifetime than a typical hard drive. A run-of-the-mill 5400rpm or 7200rpm consumer 3.5" drive is good for about 5000 - 15000 parks; Lenovo OEM hard drives should support significantly more before showing signs of failure.
Now, how many more, I don't know. If it's parking every 5 seconds (do you live on a train?) you might have an issue. It isn't really designed to be constantly parking -- you're supposed to use your laptop on a flat surface, only occasionally triggering the active protection when you carry around the laptop while it's on, or accidentally drop it.
Also, be warned: aside from completely voiding your warranty on the laptop, installing a non-Lenovo hard drive into a Lenovo laptop and using HDAPS will probably kill that drive pretty quickly due to the aforementioned "special" drives that Lenovo uses.
If you are noticing that HDAPS activates very frequently and that's just how you use your laptop (in a fighter jet? I have no idea...) then you should really consider replacing your HDD(s) with a(n) SSD(s). Cost and capacity aside, SSDs will all but eliminate the fear of damage through drops, inertia, etc. -- you'd have to physically crack the drive to break an SSD from physical trauma, and anything that strong would probably also destroy the case/keyboard/panel also.