The British Army did keep a larger standing army than the US did, and a lot of its officers saw service throughout the empire (including in the Indian Army) during the wars. If anything that helped keep the British Army “sharp”.
If anything, Canada was worse off. The US Regular Army was headed by a lot of elderly generals with very old views on warfare. Most of them were forced to retire after the Louisiana Manoeuvres and a couple of turf wars over who the (mostly nominal) tank units were supposed to be controlled by. The Canadian Army didn’t have that kind of shakeup, which meant that a lot of the older generation (I wouldn’t be so discourteous to call guys like McNaughton “deadwood”) were still in place.
A Brigadier General (US Volunteers) no less. Chances are, your Commanding General’s probably a Captain in the Regulars or something.