Still trying to get my head around what this means in practical application.
From Websters:
Omnipotent - having virtually unlimited authority or influence
potent - having or wielding force, authority, or influence : POWERFUL
2 : achieving or bringing about a particular result : EFFECTIVE
Even potent carries the meaning of having force, authority, or influence and not necessarily wielding it. One could have it and wield it or have it and not wield it.
What you're describing seems to fit the second meaning.
I had the impression that omnipotent in reference to God referred to the first meaning.
Given that, just because someone chooses not to stomp ants all the time doesn't mean they lose their power to do so.
IMO, they aren't saying that God has all the power, but that he is the most powerful. I feel that the Bible reference deal with being the most powerful, as opposed to, unlimited power.
"Peshat is what I say and derash is what you say." --Nehama Leibowitz