I completely understand. I hated it at first too. As I saw my daughter progressing in it, I realized she was being taught to do math the way I do math in my head, and I assume most people do.
For example, if you ask my daughter what 18+12, she could answer that really quickly and tell you 30. She would tell you how she did that was 18+10 and then plus 2. And she was taught to do it the same way on paper. Seeing it on paper threw me off big time. But when I talked to her about it, I realized I do the same mental exercise in my head.
I will say I did have to completely re learn long division, which was kinda embarrassing to admit.