Is this a fair weather bike or will it see miles in the rain, etc? Yes, more grease does add a little drag on the bearings but enough grease so you get some squeezed out at the axle means you have a watertight seal as good as the grease you used. (Marine grease and you will probably be able to ride the hub a few inches under water. But do your bottom bracket and pedals too unless they have good seals because the will go deeper!)
I ride all my bikes in Pacific northwest weather. All get marine grease for the non-sealed bearings so I don't have to track which bike has what,