Miah, when your ground has terracing you can stand wherever you want; if you want to sing, you stand with a bunch of like-minded souls who have the same intent; if you don't like the people in your vicinity you can easily move. Once you've found a place that suits, you return to the same spot every match with the result that over the years, you stand alongside the same strangers, nod to them, discuss team selection, moan about the manager/referee/price of Fanta and not much more. You recognise them but you don't know their name, telephone number or where they live.
Then the terracing disappears and you move into an all seater stadium (you'll have to imagine this part) and you have to decide where you're going to buy your season ticket. You'd like, perhaps to be able to sit alongside the acquaintances with whom you're used to spending your Saturday afternoons but unless you've pre-planned it, that's never going to happen. Thus kindred spirits face being split up so in anticipation, the club designate a 'singing area' which quickly attracts a number of 'not really singers but who like the thought of a noisy, irreverent afternoon' at the expense of later-off-of-the-mark dyed-in-the-wool yellers and shouters; The atmosphere changes all around the ground; people who've stood happily with others turning the air blue (with their language, you understand) suddenly find themselves sat next to a dad with his ten year old daughter or even worse, next to some sad old git who owns a scruffy, provincial computer shop; former singers in the choir find that they're now soloists.
A new stadium changes everything - certainly with big positives in our case, although the atmosphere does change and not consistently for the better. I wouldn't want to go back to the old AG though. The new stadium is a hundred thousand times better.
Enjoy the terracing at the Mem while you've got it, Miah. Those decades will quickly pass.