Just double checked some 7T data suffering from pronounced distortion - and can confirm. In an area that survives throughout the echoes, which shows clear distortion (for example, when flipping back and forth between dir-AP and PA), the region does not show any displacement over echoes.
Signal drops will absolutely increase over TE, and in areas like the orbitofrontal cortex, this will, in some visual sense, follow the patter of distortion but it isn’t a manifestation of increased distortion over echo time.
There can be effects over echo time, particularly in ultra high resolution MRI (how topical @ofgulban ), but I think for most use cases in fMRI it isn’t worth the worry.