I love the semi-colon; the elegant little half-way pause, something between a comma and a full stop. I use it a lot, and would be lost without it.
This was brought home to me by a book I'm reading at the moment. It's an interesting true story, but for me, spoilt by bad writing (this is even worse, because it's ghosted, so someone was paid to do the actual writing). While reading this book, it suddenly struck me that the writer doesn't use a single semi-colon anywhere in the book; and boy, does it need them! The sentences are either short and abrupt, or long and rambling, with only commas for pauses. And commas are not enough.
Is the use of semi-colons (and colons) taught in schools? I've no idea. But if it were given half the attention that seems to be lavished on the ubiquitous exclamation mark, then the world of writing would be a better place! (And that was an exclamation.)