Could anyone provide me with examples of cells with high organelle to cytoplasm ratios (heavily packed), and examples of cells with low organelle to cytoplasm ratios (sparsely packed)?
The structure of a cell is highly related to its function. For example, a plasma B cell (a type of immune cell) contains lots of ER and Golgi because its job is to secrete antibodies, which are proteins, in your body. It has to create a lot of proteins, so a plasma B cell has a lot of organelles that help create, assemble and secrete proteins.
There are so many examples you can use.