I have a walnut butcher block island top and it's 2" thick. I love the look and don't think it's too thick, but it's not the main countertop.

Most are 1-3/4" thick from what I recall and you want butcher block to look authentic in my opinion. So no it will not look to thick.

Mine is 2" thick it is perfect.

Thank you, everyone! My options are 1.3" or 1.7". I just didn't want it to look too heavy, since it will be more of a bar area (bar sink, beverage fridge, a few drawers) with open shelving above.