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Also we have increases the frequencies that we use. Back then it was C-Band, now everyone is using Ku or higher.

This was a home built circ polarised yagi (it was VHFish/UHFish, I forget the freq), it was big and a bit unweildy (a bit of 2x4 bolted to an upright) but not giant and not a dish

Yes, all three in combination. GaAs PA, low cost GaAs LNA, and Turbo coding are what made it possible in the 90’s.

You’ll notice that many dishes are wedged shaped than circular. This is to keep the beam width under the 2 degree spacing of geostationary satellites.