Don't overwater. They like to dry out between waterings. So before you water make sure the first 1/2 inch of soil is dry then water.

Cilantro should be planted in two week increments for use while it is fresh. But maybe you are planning on doing a bunch of drying of the herbs?

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You can definitely use them fresh. I just didn't believe you would need the harvest from 50 plants all at one time. That would make a lot of stuff. I had maybe 4 plants last year and had more than i needed of the cilantro and the coriander so I didn't plant it this year. I will next year but it would have been wasteful to do it this year. I also used it as a trade seed and gave bunches and bunches of it away.

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Yep their germination rate is pretty high. Next year you may want to plant some every other week that way you will have it fresh through out the growing season.

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Mine were fine and didn't need any additional support. What kind of fertilizer do you use?

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What is the soil like that your growing the cilantro in? I've never fertilized my cilantro and I've never had that problem.
When you say "frowsy", do you mean it's unedible? Is it still green? Does it still produce a lot of leaves? Or is it discoloured and dried out looking? Remember to pick it as it grows - this will make it produce more and keep it from going to seed.

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unless you want seeds rather than leaves make sure you don't do what I did with mine this spring and let it flower.
As soon as the flower stalks appear (they look different/thicker than the leafy stems) cut them down because once my cilantro started producing flowers on them the leaf production stopped almost overnight.

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Nature is the art of God ~ Thomas Browne,1635