Yes spring break was a concern but I didn't think the first week would be that time yet. And it was showing it as green on the few crowd predictors I looked at.
How would you think those two weeks compare to the week after labor day or any week in October?
I don't think any week in the year is more dead than the 2 weeks after Labor Day, but 1st week of Feb is probably one of the few weeks that is close to it. October I think tends to be more crowded now with the MNSSH and F&W attracting more crowds and locals.
Like you pointed out, most schools don't usually go on spring break until the 2nd or 3rd week of March in most of the country, so I think if you went the 1st or 2nd week you would be good. I don't know how DW crowds are firsthand then, but I know DL is usually a lot lighter in crowds the 1st 2 weeks of March.
Here are what the resort crowds were at DW for the first week of February and 1st week of March from the last 5 years (2014-2018) (according to TouringPlans).
(I took the daily resort crowd levels each day for the week (Mon-Sun) and averaged it for the number)
2018 - 1st week of Feb - 6.57
2018 - 1st week of Mar - 6.14
2017 - 1st week of Feb - 4.57
2017 - 1st week of Mar - 6.71
2016 - 1st week of Feb - 4.71
2016 - 1st week of Mar - 4.14
2015 - 1st week of Feb - 3.71
2015 - 1st week of Mar - 4.43
2014 - 1st week of Feb - 4.00
2014 - 1st week of Mar - 6.29
So using the data from the last 5 years, the 1st week of Feb averages to 4.71 for crowd levels and the 1st week of Mar averages to 5.54. Neither are bad really.
Hope this helps you!