I dislike significant whitespaces because when there's a lot of code that has multiple nesting levels it becomes a bit hard to follow. I like it when my code has a beginning and and ending token ({ and } in JS/C/C++ or `begin` and `end` in Ruby). Whilst writing CS I found myself writing `# end` a lot.

Also, not to mention (maybe my editor lacks this feature) I like using ^M to jump from end to beginning braces of blocks, and I can't seem to do that in CS.

However, all of these arguments just boil down to "this is my personal preference"