Definitely increase its value. As adoption increases, the network effect starts kicking in.
One of the reasons for the explosion in price today is that more and more people know about Bitcoin.
The answer isn't as simple as this, it would definitely not "definitely increase its value".
The question is whether the transactions result in selling Bitcoin for another currency or not. If we sell more Bitcoin for fiat or any other currency at a rate that exceeds the block reward rate (and thus growing supply) we will see a drop in price. Supply would be exceeding demand.
More specific to your question, if your transactions keep your bitcoin in the bitcoin ecosystem it would have a neutral effect on the price. Your transactions aren't influencing supply or demand (well, they're doing their part to keep demand stable...that's something!)
Adoption would only be influenced if your transactions are bringing new people into bitcoin, a purpose which transcends the transaction itself.
It's a good question, but don't fear that if you spend your bitcoin and use it as a currency you're going to do something to negatively effect bitcoin.
If you want to increase adoption, get into the habit of asking "do you accept Bitcoin" every time you try to buy something in person. And be ready to spend if/when the merchant says "yes!"