Yes. I use them for dynamically hiding/revealing the relevant part of a table, e.g. a course.
Viz.
<table>
<tbody id="day1" style="display:none">
<tr><td>session1</td><tr>
<tr><td>session2</td><tr>
</tbody>
<tbody id="day2">
<tr><td>session3</td><tr>
<tr><td>session4</td><tr>
</tbody>
<tbody id="day3" style="display:none">
<tr><td>session5</td><tr>
<tr><td>session6</td><tr>
</tbody>
</table>
A button can be provided to toggle between everything or just the current day by manipulating tbodies without processing many rows individually.