Your garden is probably larger than mine and I appreciate some people are stuck with what they inherit to an extent when they move in, if major work is needed. Fair play to you for knocking it into shape.
But none of the gardens where I am are particularly large, and they'd all be improved...
As slight aside, when I look out of my upstairs back window, I am AMAZED at how some people value their gardens, or rather don't. I'm not saying mine is like the Hanging Gardens of Babylon, but I've done a fair bit with it, putting borders and plants in, woodchip, solar lights, keeping the lawn...
1. Nobody here knows where you live. So how can anyone help you find an aerial pic from 25 years ago ?
2. If it looks great now, then why are you looking to wind the clock back for a bunch of strangers who mince past your front gate every once in a while ? Enjoy what you have, and do what YOU...