How much teaching in Sweden is done in an intensive block mode?
It varies, most likely between universities but also between disciplines. In my field, a social science, the bachelor level has full-time courses except the final semester in which two courses run in parallel. At the advanced level, the students take two courses at the same time. But in a closely related master's program, courses are given the way you describe. 

At my university in the STEM field, I believe it is more common to be enrolled in 3 or more courses simultaneously. 

For your specific situation, it should, however, be fairly easy to check online.