Work can be fun and exciting again! You might actually want to wake up in the morning and get to work early if you are dating someone you work with. Most companies frown upon the idea, but many progressive companies see the benefit in their employees being allowed to date each other. Work output has improved and moral has improved.
The only drawback to dating someone at work is if you break up. That can cause some uncomfortable feelings, but if both of you are professional and mature adults then you will be able to get through it. Another benefit is always having a lunch date, if you can work your schedules out to match your lunch times. Over all, it does create a wonderful work environment.
If you and your partner live together, it may cause some strain. While it is wonderful to spend so much time together, it may get a bit stressful. Consider taking some time alone every once in awhile so that you can have a buffer time between work and home.
Just always remember that you must remain professional. A cute closed mouth kiss at work is fine, but making out on the floor of your cubicle, probably not a great idea. So keep the hot and heavy stuff for outside of work and the cute and flirty for the office.