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I stuff mine when not in use, but they definitely do get slouchier with age. I also learned (the hard way!) not to overload them, as the straps have gotten a bit elongated over time.
I can fit my cerf tote over my shoulder with the handles, but it is not comfy at all and I think it looks weird. I don't think it was intended to be worn that way. With the detachable strap it is very comfortable. I usually carry mine as a tote, but on occasions when I feel that I need my hands free or have a lot to carry I attach the strap. If you want a bag for work I think the cerf tote with the strap is the way to go.