My margins on my e-ink kindles, including the Voyage are not wide. Neither are the line spacing. There are 3 options for those and most times I am in the middle. Depends on how the book is formatted. But the margins on the biggest setting always are very close to the frame. I wouldn't want them squeezed on there, would look horrible.
Now the Scribd app on the other hand, huge wide margins. That never has been an issue with kindles though. Not with the fires either, or the android app.
I actually own all of these devices, several, so I know.
Amazon have listened to customers. Why else would they have come out with the Voyage and give me my precious page thingies back.