We do 5 & 6 gallon batches. After some experimentation with dry,re-hydrate,& small starters,I'm finding average gravity beers love starters. Albeit a small one,mostly to wake them up & get them started on reproducing.
Works very well for my pale ales I've been brewing.
I just got a dark ale from 1.050 down to 1.011 in 11 days! Gotta check it again Wednesday or Thursday to confirm FG,then into secondary for those bourbon soaked French oak chips.
I made a small starter out of 1 1/2C boiled water,& 1/4C of whatever DME I've got for the batch being brewed. Stick a quick check thermometer in it,& cover with plastic wrap. When the temp gets down to 70F,pitch the yeast sachet in it,stir lightly,& recover.
Doing this the morning of brew day will work real well if you brew in the afternoon. It was bubbling like mad around 6-6:30 the next morning;krausen coming out the airlock by 11:15am!