My nest is full too at the moment but Iknow its only a matter of lets say a couple of years now when I will be feeling just like you .
I love the traffic going through the house and I will miss it so much when it goes altogether but on the other hand I will enjoy the peace.
Im so used to having bodies walking around or sprawled out on the sofa, music playing loudly upstairs etc. wont quite be the same when its no more.
Although on a more positive note the two that hae already flown the nest are always popping back on a regular basis, so it may not be as quiet as first thought