If my eyes were really big, would I see radio waves? Considering an assertion that the fundamental difference between different ‘types’ of electromagnetic waves is frequency/wavelength, and larger antennas are needed for longer wavelengths, if my eyes were larger proportional to the difference in wavelength between visible light waves and radio waves, would they see radio waves?
No.  But the reasons are biological, not physical.  Your eyes work by the interaction of electromagnetic radiation with certain molecules ( rhodopsin  which consists of the protein opsin linked to 11-cis-retinal, a prosthetic group.)
These molecules are tuned to detect light of particular wavelengths.  But they couldn't be tuned to detect radio-waves, since radio waves are much larger than molecules.  To detect radio waves, you need an antenna, not a light sensitive molecule.