Bostontraitor
Son
I'm not sure looking at the eyes adds much information about the leading -- one of my instructors actually recommended looking toward the lead's chest to better understand what is being led, since that is where his movement originates (there is also an interesting lead-follow exercise where the follow puts her hand on the lead's chest and he leads her just through that). For me it's easy and natural to look towards the lead's chest since I am usually a bit shorter than most leads. But I look a lot at their face / eyes as well (more than chest usually), but that is more for connection rather than to help with following.
Ha! what you mentioned here are things that actually bother me. Not you
"(there is also an interesting lead-follow exercise where the follow puts her hand on the lead's chest and he leads her just through that)."
When I first started dancing, the female instructor taught every girls in the class that if a guy gets too close for personal space or not welcoming, you put a hand on his chest or shoulder front. So if a new girl puts her hands on my chest, my dance is 99% done. Of course, there is a way to put her hand on your chest like she's your lover... you know what I mean.
"I'm not sure looking at the eyes adds much information about the leading"
Maybe in other cultures. But I feel the eye contact is necessary for me. It's the first sign that says "I am here with you". If a girl does not look at my face/eyes every now and then or all the time, or even worse, she looks around, I won't ask her for a dance again.