Quite the opposite in fact: we built this for manager-types who have many meetings and for the very reason you cited need to appear available.
It purposely makes the slots of time that we book “free” until the day is too full, and only then changes it to busy.
The result is that my calendar, for example, appears free from 11am to 2pm, but if suddenly that time starts filling up, some time (30-60 mins by default) gets held for lunch.
In other words: it does exactly as you prescribe (blocks off 1-2 hours), except without the rigidity of fixed events, making it easier for people like you to call (hopefully good) meetings.
Give it a try!