Blimey if I tried to train without treats or a toy, I think my dogs would all look at me and walk off !!
Seriously, no I dont. The training classes I have attended have all encouraged reward based training and thats what I have done. I prefer toys than treats for obvious reasons, but with having a Lab sometimes only food will work rolleyes*
I am in the process of replacing the reward for a fuss, but find the dogs switch off /get bored quicker....work in prgress, but it does work well for rewarding general 'good behaviour' like recalls when out walking etc