Ha no, I did Amiga application in 68K assembly language. MUI looks very modern compared to my Amiga experience :)
I still miss the Amiga in general though. It was nice to have complete control over the machine, working in harmony with the OS... or hosing it and causing a Guru Meditation.
I caused so many of those, lol. It is also funny how I gravitated to Linux and Qt after finally leaving Amiga. Qt back than seemed like a combination of Amiga and BeOS.
Side note:
The funny thing is I think the computers of the future will more resemble the hardware structure of the Amiga than the single chip multi-core computers of today. Once we can't fabricate smaller nor make faster calculations the module design we had of the amiga will become dominate. We are on the edge of having a CUDA built on the silicone or what Power9 is doing by giving them faster lanes.
Yes, it was modern, it maybe still is. Doesn't really care about resolution or window size, with crazy detailed system-wide configurability; set it up once, and all apps that use it look exactly like you want them to. I don't know much about GUI toolkits, other than that most apps don't resize much other than lists and seem very limited that way compared to even basic MUI applications, but I think that MUI kind of puts the modern web and "user agents" to shame, especially if you consider how old it is.
I still miss the Amiga in general though. It was nice to have complete control over the machine, working in harmony with the OS... or hosing it and causing a Guru Meditation.