We have a 42” aisle between our island and stove wall and it is fine for multiple people. If you can do 45” or 48” that would be ideal, but don’t be afraid of 42” (counter to counter) if that is the most you can get. I wouldn’t want to go any smaller though.
Our island is 9’ and I don’t feel like it is too big to walk around. I think 7’ is fine as long as it fits in your space.
Totally agree you should look at drawers rather than regular lower cabinets. SO much more functional!
Q