Tony,
I use biscuits for some jointing work - mainly when I need a carcase in MDF or ply, also for face frames although for face frames the reason is indeed alignment rather than strength.
For panels, I never use biscuits. Sometimes, for a small panel like the one you have shown, I will simply use a rubbed joint (with hide glue) when biscuits would be impossible to use and the alignment is accomplished by a sense of touch on the surfaces and edges. If I use clamps, as I would for larger panels, I would check alignment once the panel is in the clamps and if the pieces are showing a tendency to slip out of alignment as they are prone to do, I clamp across the joints with a pair of clamps (waxed, to keep them from sticking on the squeeze out).
For panels the size of table tops etc. I use my Plano glue press.
In all cases, the strength of the joint is quite adequate without biscuits, being long grain to long grain and a large glued area.
Thanks for the nice words on the site and the chair Tony.