My previous T I saw for 2 years and I struggled to look at her - whether she talked or I talked I just could not maintain eye contact.
My current T feels eye contact is very powerful and important and tries to maintain it more so with us, though it can be uncomfortable most of the time, it does help to look at her when she's saying things, it just makes it feel more genuine or something.
I know my personal struggle is that if I maintain eye contact she will see into my soul, and somewhere along the way have an "aha" moment that I am bad...