Am I cheating?
Let me ask you this: If a basketball player has a machine that pushes them around the court and shoots the ball for them, are they cheating? Or just "using an incredibly helpful resource"?
You're getting carried away with incorrect analogies. None of the things you mentioned are in any way similar to an LLM. You don't just ask a compiler to compile any old code. You give it specifically formatted code and it returns predictable output. Syntax highlighting is also a linear, automated process that is specific and predictable. As for using other people's textures, yeah if you stole them and used them without permission, absolutely cheating, obviously.
The things you mentioned are just tools. LLM is not just a tool, it completely replaces (or aims to replace) you as a creator. It also spits out wrong answers, something every techbro loves to ignore. Compilers don't just randomly compile your code in a different way. Highlighting doesn't happen differently because the thing made a different statistical calculation today vs yesterday. Calculators don't mess up unless they are broken.
Using AI isn't the same as using a tool such as a table saw. A table saw is a tool that makes it easier to cut in a straight line. The equivalent to AI would be a machine that, you drop a piece of wood in, say "make me a chair", and then it makes potentially a chair (but maybe not). You can't tell me the person who uses that is a carpenter. They are simply using the Automagical Carpentry Machine and feeling real proud of themselves for being able to push the button.