The 18th-19th century German philosophers (the so-called "German Idealists"), and other Post-kantian philosophers have used the term "intellectual intuition" in slightly different ways, but generally as a sort of perception, a sixth sense of sort, that allows the subject to sense abstract objects, a priori truth, and in the field of Kant - the noumenon world.*
As this concept is highly useful in Kantian philosophy, I wouldn't expect to find it anywhere outside this school. Even so, I'd like to ask if there's any contemporary philosopher that uses and/or researches the concept of intellectual intuition inside the Kantian school or outside of it?
*couldn't find any credible source to cite an exact definition, I'd be happy to include one if provided in the comments.