I use the calendar (under Reports in the old CG) all the time to check what workouts I've been doing when I repeat the same training program. There I can very easily go back months or even years to go find a specific workout. The month view specifically is very helpful.
Is there a way to get a similar view in the new GC - where you can see all your activities for a month in one glance? The totals graphs in the Report widget is pretty useless for how I use it.