*Didn't read the responses yet, sorry if I am repeating or missed additional information*

Question: did your agreement for the easements get recorded with your county property recorder? That will somewhat effect what you'll need to do to get rid of it, at least practically speaking.

Easements can "die" by abandonment. Periods of non-use don't always do it; you generally need to manifest some intent not to use it. You've probably already done that by getting permission to use you other neighbor's land for access, in conjunction with not using it for eight years. So if they wanted to, they could probably argue that your easement has been terminated. Not that it much matters to you.

Easement holders have an implied license to enter onto the servient property (property where their easement is) to make reasonable repairs to the easement. It doesn't sound like that's what was going on here, but I thought I should throw that out there in case it might be applicable. In terms of how to get rid of their easement, it would need to be released, meaning they would need to convey it back to you in writing. Even if you didn't record the easements originally, I would seriously consider recording the release so you have an added layer of protection against a subsequent purchaser of their property in case they want to tell the purchaser that they have an easement there. If it's recorded, that will come up on a property search for prospective purchasers, so there won't be any confusion about that.

I think your best move is to offer to do a mutual release. You convey your easement back (they likely won't know that it has already terminated in the eyes of the law), they convey theirs back, everybody moves on with their lives.