as soon as you understood the principle of the unity editor... you are unstoppable.
You can everything script with UnityJava... but you can use the editor to spare your time und just use a drag an drop system. The game preview is such a great help to adjust every public variable at runtime. In GS - I always have a big waste of time in adjusting some parameters and then look at the result... just to adjust then a little bit more.
In Unity ... you do this in one single way.
Last year, I startet with a GS-project - and just the Panel-Work of the complex menu used about 20 hours. Now I took the pics, imported them in the asset folder... and did the same as with gs in unity... just in about 5 hours. This is a phenomenal earning of time. But to be honestly... I learned during 5 Months (2h per day) to understand the principle of unity.