I have an achilles tang in his 7th week of quarantine right now. If I had put him in the main tank right away, he would of become another achilles tang statistic because he had marine velvet and ick.
A quarantine tank isn't that hard to set up. If you have a hob filter, you can keep the sponges for it in the sump of the main tank. When a new fish is expected in, just fill aquarium with water, add cheesy tank decorations for hiding places and use the already bacteria seeded sponges for your biological filtration.
After the fish are put in the main tank, you take the quarantine tank down, bleach everything, put new sponges in the sump and it is ready for the next fish
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