I have to admit I dont understand why you would ever have to count tests. When im building tests I just add the new ones to the test files, and run the tests, note the number of tests it whines about being unexpected and then add that number to the plan. Never seemed like a lot of stress to me. :-)

Oh, I also usually run my tests suites during development without using harness so I can see everything. In fact, I've written a test framework in DDS that will automatically generate a passing test from a failing test, so that all I have to do is review what the results were, if they were correct I cut an paste the new results into my test file.

Also other approaches would be to build a framework like this:

use Test::More;
use_ok('Some_Module');
$obj=Some_Module->new();
isa_ok($obj,'Some_Module');
my @tests=(
           'is($obj->accessor,"Some value","accessor")',
          );
plan tests => 2+@tests;
eval $_ for @tests;
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In short there are lots of way to be Lazy without being lazy about counting your tests. :-)