Is it bad design to use table tags when displaying forms in html?

I think it's a myth that forms are "difficult" to layout nicely with good HTML and CSS. The level of control that CSS gives you over your layout goes way beyond what any clunky table-based layout ever would. This isn't a new idea, as this Smashing Magazine article from way back in 2006 shows.

I tend to use variants of the following markup in my forms. I have a generic .form style in my CSS and then variants for text inputs, checkboxes, selects, textareas etc etc.

.field label {
  float: left;
  width: 20%;
}

.field.text input {
  width: 75%;
  margin-left: 2%;
  padding: 3px;
}

<div class="field text">
  <label for="fieldName">Field Title</label>
  <input value="input value" type="text" name="fieldName" id="fieldName" />
</div>

Tables aren't evil. They are by far the best option when tabular data needs to be displayed. Forms IMHO aren't tabular data - they're forms, and CSS provides more than enough tools to layout forms however you like.

Yes, it does apply for form layouts. Keep in mind that there are also tags like FIELDSET and LABEL which exist specifically for adding structure to a form, so it's not really a question of just using DIV. You should be able to markup a form with pretty minimal HTML, and let CSS do the rest of the work. E.g.:

<fieldset>
    <div>
         <label for="nameTextBox">Name:</label>
         <input id="nameTextBox" type="text" />
    </div>
    ...
</fieldset>