I am married to one of these men. And yes, he likes to sit there and have some quiet alone time.
And yes, he will go in there when we are just about to leave! Our daughter and I usually groan and he will say "I will not be long". We sit down and read a book if we are not on a schedule.
Our daughter and I always go to the bathroom before we leave the house, but we pop in and out.
I have just told him "Honey, I will see you there!"
He hates it, but we have had it out many times about how I like to be on time, if others are waiting.
Here is one of those Squatty Potties.. It is supposed t be the best way to potty.
You old timers know I have said for years. Many toddlers like/need to have a place to put their feet to push against, to be able to have a BM on the potty. There is an actual reason along with the fear of falling in.
http://www.squattypotty.com/