Gardens by the Bay in Singapore isn't just a garden; it's an experience, an architectural marvel, and a testament to what's possible when nature and innovative design intertwine. Your observation about the long queues during summer is spot on – it's a crucial point for any visitor to consider, especially during peak seasons or holidays. However, let me emphatically echo your sentiment: these places are absolutely worth visiting, and your decision to return twice speaks volumes about their enduring appeal.
For those planning a trip, be prepared for the crowds, particularly at the ticketing counters and entrances to popular attractions like the Cloud Forest and Flower Dome. My advice? Book your tickets online in advance to save precious time and bypass some of the wait. Arriving early in the morning right at opening, or visiting later in the afternoon, can also help mitigate the busiest periods. The Singapore heat, especially in summer, can be intense, so staying hydrated and taking advantage of the air-conditioned conservatories are musts.