If my eyes were really big, would I 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.