Water and grass and stuff will probably tile fine, try tiling bricks with it though an be amazed when you get bricks fading into eachother and mortar joints that end abruptly in the center of another brick.
30 minutes isn't that bad, you can do most stuff a lot faster. If you do a good job you'll use them again and again, I have a steel plate and wood texture I use for everything now.
If you found an editor that works for you thats great, I'll check it out when I get home.