GSX would be 1000% better if I didn't have to scramble during the taxi-in to correctly configure the gate and restart Couatl, all while navigating my way around the airport.
The whole attitude is wrong. Bear with me, now:
Assume we had an uber-editor that you could potentially launch from outside the simulator, like a super-ADE, with 3d preview, etc. Something that might took years and so much money to develop, that would cost more than the simulator itself. What you would do with it, and how you'll use it ?
You will probably dedicate some time to work on it, without flying (you cannot fly, it's an "editor"), so you'll likely take some time to Prepare (pun intended) your airport, without thinking about flying.
Then, once you'll be satisfied with what you did in this uber-editor, that costed so much work to us to do, and so much money for you to buy, what you will do next ? You'll start the simulator, and go flying, knowing the airports you just configured will surely work.
Now, replace "uber-editor", with Prepar3D (of FSX, if you like), and that's your editor. Bonus feature: it doesn't cost anything more, because you already bought it, and with the time we spared not doing something you could already do with the simulator, we could actually improve GSX to do thing you CANNOT do in any other way. It doesn't even require exiting the editor and entering the sim, since they are one and the same!
The whole concept is, resist the temptation of flying every time you start the simulator, and accept that sometimes you'll use it as an "Editor".