Patrick....what type of bulbs are you talking about?
Here's been my experience with bulbs....we have heavy clay soil and your experience may be different than mine.
Tulips....flourish the first year or so. After that, the flower heads become very small and eventually disappear.
Hyacinths ..... 2 years of full, hardy flower heads which gradually become looser and less full. Most garden books suggest replanting in a spot where you can enjoy the fragrance but is not in your prime "showcase" spot.
Daffodils.....my favorite. They flourish year after year. A little bulb booster or bone meal after they bloom gives them a bit of a push for the next year's show.
Grape hyacinth.....these guys spread and get more glorious year after year. A clear winner in my garden!
Also.....Never, ever cut down the foliage of a bulb after it blooms. The foliage absorbs nutrients essential for the following year's bloom.
Hope this helps.