For me it takes just as long to keg a batch as it did to siphon beer from the fermenter to the bottling bucket when I was bottling. Replace bottling bucket cleaning time with keg cleaning time.
Time saved = however long it took me to wash, bottle brush, rinse and sanitize every bottle, along with the actual filling/capping time.
I won't say I'll never do that again, but I will say that I don't miss it.
You're doing it wrong.
I doubt it. Whether you clean/sanitize 50 bottles beforehand or not, cleaning 50 bottles takes longer than cleaning 0 bottles.
Meh, this argument really has no bearing on the overall time spent packaging your beer. Bottling or kegging, like stated above, there's a good amount of maintenance either way. Kegging has a lot more complicated maintenance, frustrating at times... It's great for lagers and hoppy beers, definitely. This isn't supposed to turn into a kegging vs. bottling thing, I don't think. Just saying, each has their place and I very much disagree that kegging saves time over bottling. On packaging day, yes, but overall, I'd argue they're fairly similar in time spent.
And "cleaning and/or scrubbing bottles" is totally unnecessary, especially if you rinse them well after pouring and store them upside down.
Anyway, each has their place. I have a bit of frustration with my used kegs and getting a good seal on them for the 3.5 to 4 gallons that gets kegged. Sometimes I'll have beers carbonate mostly in a week and sometimes they're still kinda flat... It can be frustrating. Seems like there's always something. I'm sure the pros go through this crap too.