Could not possibly be more wrong, you've clearly never played WoW or any other MMO by that. you can draw/sheethe weapons in WoW while moving, swimming, jumping just by pressing the default Z bind, it also does it whenever you use a spell, skill or enter auto attack on a mob(even if it's out of range) the same can be said for pretty much every major MMORPG released in the last 8-10 years if not even further back.
WoW:http://www.youtube.com/watch?v=TgE8T...eature=related
See how he simply runs in and.....without stopping his weapon is in his hand?
WoW (again): http://www.youtube.com/watch?v=Gcp6yeY8Dh0
As soon as the event ends they engage the boss no having to stop and switch the start tanking, dpsing and healing as soon as he turns attackable.
WoW(Last one): http://www.youtube.com/watch?v=iatGk4TOlEA
Watch the Square marked tank, his weapons are clearly undrawn until he engages a Guardian of Yogg-Saron he does not have to stop for five seconds, he does it as he charges(or more likely, as he right clicks the mob when selecting his target)
Rift: http://www.youtube.com/watch?v=SodmRF7gKHM
Note how i charge into every boss without having to stop to draw my weapon, the weapon is in my hand and combat begins the instant i charge in.
Rift(again) http://www.youtube.com/watch?v=_Bf6TGuIJ_g
another video for rift, not being tank PoV you might be able to see more clearly that they simple move in and start their opening rotations, it's smooth and seamless
Rift(last one): http://www.youtube.com/watch?v=ej7wnWXNqVA
If anything this is the best example as you can see, weapon is at his side, then he buff's and it's in hand, theres no delay the buff is cast as soon as the key is pressed, later on you will also see them going from pack to pack without having to stop and draw weapons
Aion: http://www.youtube.com/watch?v=ATHIgoAfrJk
Again, no stopping to switch to "active mode" they simply click and kill.
Aion(again): http://www.youtube.com/watch?v=FevmV...eature=related
He runs into range of the trash and his weapons in hand without him stopping.
Lotro: http://www.youtube.com/watch?v=AttDr...eature=related
See here, he targets and fires no stopping to pull his bow out of his bum, target mob and shoot nothing else.
Lotro(again): http://www.youtube.com/watch?v=wx70o...eature=related
3man instance run, lot's of examples here
WAR: http://www.youtube.com/watch?v=Hn3lVtUECd0
Same as all the above, seamless transition into combat.
Everquest 2: http://www.youtube.com/watch?v=WwRvq...eature=related
He just moves into range and casts.
Dark Age of Camelot: http://www.youtube.com/watch?v=ewg9N...eature=related
Same as all the above
Vanguard: http://www.youtube.com/watch?v=lNpb1...eature=related
Again, same as above, the slowest paced game in my list so far yet his weapons out and his skills being readied the second he presses the key.
Runes of Magic: http://www.youtube.com/watch?v=4Uekq...eature=related
Allods Online: http://www.youtube.com/watch?v=XzVnf...eature=related
Guild Wars: http://www.youtube.com/watch?v=VTrXf...eature=related
Age of Conan: http://www.youtube.com/watch?v=ZnqFjAVuuPg
Might be wanting some sauce to go with those words of yours?