It really depends on what you are comparing.
Displaying graphics in any Real Programmiing Language(AKA not a form of BASIC) would be very complicated, but Space Guy's wrench events mod, or the TDM mod are more complicated than simple input checks.
It gets easier though, the more you work with it, as it gives HELPFUL error messages and warnings whenever something would not work instadd of continuing on and playing the game and only saying where you went wrong, not how.
The larger problems are based on the programming language you are using.
In C and all related ones, you may accidentaly corrupt a pointer and end up with the program breaking very far from the actual problem making debugging impossible, while in orther higher level programming languages you are likely to never have to deal with those problems but they will likely run slower, and sometimes it would be harder to get it to do what you want it to.
