Show Taxonomy Name not TID in Views Query String
You can use taxonomy term names with this filter by adjusting Specify validation criteria settings. here's a screenshot:



Make sure Specify validation criteria is checked and you should be presented with more options. Under Validator choose Taxonomy term. You can optionally select with vocabularies to allow. Under Filter value type choose Term name converted to Term ID and check the Transform dashes in URL to spaces in term name filter values checkbox.