I teach first time kilt wearers to "Sweep the pleats" or "Scoot the boot" Both which have been discussed here.
And yes, UK's pleats are hard and unforgiving. At least until 5 or 6 washings w/ Downey.
And yes,I sometimes wear trousers.
And yes, kilts are only one part of my wardrobe.
But you learned to sit in trousers. Now you don't even think about it. I don't even think about sweeping my pleats now.
Going kilted or not is a choice, your choice.
For me, wrinkles are a fact of life. I prefer and choose to not show wrinkles in the back of trousers. I think that a good pair of dress trousers with a wrinkled butt after sitting, to be FAR worse than a simple sweep or scoot.