Firstly, I'm not sure if you are aware that the "golden" Sacagewea and Presidential Dollar coins actually do not contain any gold whatsoever. The US mint did a very poor job misleading people about this.
Dollar coins are only collectable if there are in uncirculated (never used) condition... and even then are only worth one to three dollars depending on the year. These coins are not rare and will not be much more valueable in the future. This doesn't mean that it's not still fun to find them in your change and keep them if you want to
On the other hand, if any of the coins you have pre-date 1965, then they contain actual silver and these will be worth something. This goes for half dollars as well. Hope that helps!