Just because there's one unintuitive step that doesn't mean everything following that is incomprehensible without math though. The fact that the speed of light

Just because there's one unintuitive step that doesn't mean everything following that is incomprehensible without math though. The fact that the speed of light is constant might be unintuitive, but once you accept that, the fact (for example) that you can never reach it is intuitive. As is the fact that it would require infinite energy to do so. It's perfectly fair for someone to seek an intuitive explanation even with an unintuitive assumption. I have no idea whether there is one in this case, but it doesn't seem true that there's nothing intuitive about special relativity.