Floaters are from varying densities in the vitreous (the gel filling the inside of our eyeballs). We are born with very clear and uniform vitreous gels, but as we age, some portions of the vitreous liquefies and varying densities results (the process of liquefaction is call syneresis). These varying densities then cast shadows on to your retina, which are now percieved by the patient as "floaters", hence the term "vitreous floaters."
So your husband is correct to a certain extent. Yes, they are there 24/7, but you only usually notice them in high illumination conditions or when you are looking at light colored objects due to the high contrast that the conditions provide.
Myopics have longer than normal eyeballs, which makes them more prone to retinal detachments. The longer the eyeball the higher your grade, the more prone to retinal detachments. Floaters may be a sign of early detachments. Specially if there are a lot of them and when they are accompanied by flashes of light when you move your eyes in a rapid manner.
So it would still be a good idea to have your eyes checked. Floaters can be nothing or something, thus it is best to see a good ophthalmologist to have yourself cleared.
I am an ophthalmologist