azzaman333
meh
Not exactly. Generally i spend several seconds moving my stack or two, and then i waste a lot of time moving reinforcements to these stacks. If there will be a smaller number of units, it may be possible to spend less time managing an entire attack, even without stacks.
Waypoint so all units go to the nearest border town, stack the new units at the waypoint town, move them towards SoD which will be slower due to healing, bombardment and the uncovered roads from city conquering. Most of my time spent playing is spent on worker management because they all need individual orders, and stacking them wastes worker turns.