"Gel pillow" is a bit of a misnomer ... I tested both a king-size and standard-size model at home. I'm happy to report that they're identical in feel and comfort to the ones I've experienced ...
Alas, there is no one-size-fits-all pillow for side sleepers ... sleeper who is simply looking for comfort and support, a standard pillow shape can likely get the job done. And for a standard ...