I noticed some interesting, and in my case not desirable behaviour when I was exporting the results from a SharePoint survey to Excel: the order of the questions in Excel differed from the order in SharePoint.

Some further analysis showed the following:
When you export to Excel, the order is determined by the creation time of a question, so the questions that were create first appear before the others. This even happens after you reordered your questions in your survey, which was what I did.

To give an example:
I create a survey with 3 questions in the order 1,2,3:

I then reorder them to 3,1,2:

If I export them now to Excel, the order of the columns however is still 1,2,3:

So in case you need to export to Excel and don't want to reorder your columns there afterwards, make sure you got the order right when you create your survey questions.