I live in Washington State. I have a shared driveway with an easement which allows us and our neighbors ingress/egress access to our properties. The driveway is in the shape of a hairpin, which begins on my property, goes on to his property and then terminates on my property. It is a very steep slope with no room on either side. As the driveway ends directly into my carport, my neighbor takes issue if we park outside and directly in front of our carport as this is part of the easement that crosses his property. When we do this (which is rare), we are not blocking his access to anything. His carport is at the hairpin portion of the driveway. When he parks in front of his carport, it becomes very difficult for us to get around and down to our carport, albeit possible.
It seems that the width of the easement is key in asking this neighbor to be more "neighborly" (this is lake property and parking is at a minimum). i.e. If he's jutting into the easement (every time) when he parks, then to ask for the same courtesy (occasionally) would seem reasonable. I am not interested in asking to break the rules of the easement however if he is completely within them himself. He's too awful to even bother with. We'll just make our guests walk. There is no width description in the original warranty deed.
Corporate / Incorporation Lawyer
Easements can be deeded easements, which means they are subject to conveyance, and have intrinsic value, or they can be easements by necessity. It is unclear if the easement was created by a simple use agreement, or if it is one of necessity. For the most part, the simplest rule to follow about long standing easements is don't block the easement, build fences or place gates across them, and you won't have trouble. If worse comes to worse, you can always seek judicial intervention to define the rights and responsibilities of the parties vis-a-vis the easement, but it seems that acting "neighborly" as you put it, might be the easiest way to go.
Real Estate Attorney
In Washington, the parameters of an easement are determined by the intent of the parties as expressed in the recorded easement document. The dimensions, precise location, and purpose of the easement should therefore be be determinable from the description in the easement agreement itself. Your warranty deed's legal description likely only references the easement as a "subject to" restriction, so you will likely need to obtain a copy of the recorded easement document in order to figure out what your options may be. For instance, if the easement is for ingress/egress only, and doesn't include parking, your neighbor's objection may be well founded. You should consider obtaining the easement document and discussing your options with an attorney, including the possibility of negotiating a use and maintenance agreement with your neighbor that would provide a framework of rules for use and upkeep of the driveway area that would be mutually acceptable to you and your neighbor.