Is pesexec only useful with administrative credentials?

I am an apprentice penetration tester, and I am trying to read as many tutorials and practice as much as I can.

Something I continually see reference to is using psexec to execute commands remotely.

However, it seems psexec only works with administrative level credentials, is this correct?

Can psexec be leveraged with user level credentials? If it is not, is there any use to psexec without administrative level credentials?

All the examples I have seen have administrative level users using psexec.