I get sick too from playing this game more than one hour straight. Never had that with any other game. I thought it might be the flashing blue lines from builder mode but I can follow your explanation too.
More of an argument for TPV is the interaction with other characters. It is way more inviting for me to interact with someone if I can see myself. Just by moving around, crouching, jumping you can have some basic communication.
Also I'd like to find out if building in TPV will be easier. Because now I spent way to much time flying to and from to get a good perspective on my subject.
I've added a suggestion here