I see this as a feature request rather than a bug. It currently exports the data in the same structure that it is stored in the database.
To be honest, I have no intentions of making improvements to the Survey feature myself. My reasons are purely selfish, I plan to make an upgrade of my Form Wizard Pro add on product so that it supports surveys. Currently its like a one page survey, but I already tackled the export issue in Form Wizard, even though it stores data similar to Survey, I transform it into a table with questions as columns, before exporting. So, it will be working against my own interests if I were to try and improve the free Survey feature. It competes against a paid product I'm selling so I can eek out a living. All I need to do is make Form Wizard support multi-page forms and basically its a survey. I hope to release the upgraded version by the end of January and I hope it will sell more once it can do surveys.
Hope you can understand.