Probably way too many things to count, but here are a few...
I use MechJeb launch assist because I'm too lazy to do my own gravity turn
I can't build/fly a plane, SSTO, or shuttle to save my life
I used to not be able to build a craft capable of landing on the Mun or Minmus (since gotten so much better, am doing that very regularly in my career save)
Too scared to send any craft out of the Kerbin system, but I'm hoping to change this in the next few days!