If you say you do not spend your time looking at people intently over prolonged periods of time, and you do not like seaweed legume with lentils, I might believe you. The advice we compare here is not quite true about the Present Perfect Continuous, either.
"The verb forms of be, do, and have can be used either as a main (full) verb or an auxiliary verb," we can learn online, as from TALK ENGLISH. We can read about auxiliaries and main verbs many places. The good trick you can get only here is: verbs can help tell "where" we are in our thoughts about time.
You may have been told to mind and use the Perfect tenses, to look and sound smart. Beware: there are things I would not tell grandpa, not to look and sound pliable. We can compare some rules on the Present Perfect and reckon.
It is usually with the Present Continuous that we get to learn special verbs, or we are told to tell normal verbs from... it must be, some other kinds of verbs. Granny has a trick, and Granny is going to see if the trick works with a grammar test.
It is no wonder that human existence has been of description by philosophers and literary people. To discuss the Present Simple, we may get to mind "general facts that are always true and permanent" — now. Granny has a way.