I use a secondary because it is part of my bottling process and lets me be lazy without worry. Once in the better bottle, you can get a carboy cab with a center hole for the racking cane and attach the bottling wand with a hose to the other end. Blow on the other tube to start the flow and you can bottle by yourself stress free. I found this to be the best way to bottle after lot's of trial and error.
Also with the secondary I tend to DH often, which I think makes a better beer in many cases (and I like to DH anyway). You cam also park it there without worry because the beer will be just fine for as long as the laziness is there
But if you leave it alone after racking to the BB does't all the priming sugar get used up? or do you use carb drops? I rack to a bottling bucket with a spigot and have no problem bottling by myself.
I don't add any priming sugar until just before bottling the beer.
I've always had trouble connecting the bottling wand to the spigot on the bucket because the hoses just don't seem to fit. Never found a connector to go from the 3/8 down to the 7/16 and end up with some leaky hacked up contraption.
When just bottling from the spigot or a short length of hose, I always feel like the beer is being oxidized as the beer runs down the side of the bottle like it is being decanter-ed. Bottling wand rules and the carboy cap makes it easy to use.