There's always a lot of discussion about follow-up with brides...How much is too much, how much isn't enough, blah blah blah. You'll get a different answer from everyone you talk to, so the issue will never be settled.
One thing that is definitely true, though, is that when you don't follow up with other professionals, you're missing out on opportunities. Word of mouth is the best way to get business, regardless of what every SEO "guru" says. People trust their friends, and they trust the people they've already hired. A referral from a trusted professional is a powerful thing, and the more good professionals you know to refer clients to, the more who will be able to refer back to you.
How many times have you said to someone "I'll call you" as you take their business card? Then you get home and the card goes in the stack of cards or the rolodex, never to be seen again.
I'm guilty of this, too. Some of it is just being busy (everybody's busy) and not following through. If you don't follow through, though, you could be missing out on referrals, information, or just meeting someone new who can expand your understanding of the wedding industry.
So make a not-quite-new-year's resolution. If you say that you'll call, send information, or do anything for another professional, do it. It's a simple thing that doesn't take much time, but can expand your referral base and help your business.